OPINION

Jane Doe and Sarah Parrish appeal the district court’s dismissal of their Title VII suit against Goldstein’s Deli, et al. The district court dismissed their complaint pursuant to Fed R. Civ. P. 12(b)(1). For the reasons that follow, we will affirm the judgment of the court.

I.

Jane Doe and Sarah Parrish sued their employer, Goldstein’s Deli, Daniel Dieffenbach and Charles Welki pursuant to Title VII of the Civil Rights Act of 1964, 42 U.S.C. § 2000e et seq., alleging sexual harassment. The defendants moved for dismissal under Fed.R.Civ.P. 12(b)(1), arguing that the district court lacked subject matter jurisdiction because defendants did not fall within the definition of “employer” as required under Title VII. Both parties conducted discovery, filed several briefs in support of their positions and participated in an evidentiary hearing involving fourteen witnesses conducted over the course of four days. Following those proceedings, the district court granted the defendant’s motion to dismiss. This appeal followed. 1

We have jurisdiction over this appeal pursuant to 28 U.S.C. § 1291. Our review of a motion to dismiss is plenary. State Farm Mutual Automobile Insurance Co. v. Coviello, 233 F.3d 710, 713 (3d Cir. 2000). We review the factual findings of the district court for clear error. See Carpet Group Int’l v. Oriental Rug Importers *775 Ass’n, 227 F.3d 62, 69-70 (3d Cir. 2000) (explaining that “this Court reviews the District Court’s ... findings of jurisdictional facts for clear error”).

II.

We begin by recognizing the crucial distinction between 12(b)(1) motions that present a facial attack on the complaint and those that question the existence of subject matter jurisdiction in fact, apart from the pleadings. Mortensen v. First Federal Sav. and Loan Ass’n, 549 F.2d 884, 891 (3d Cir. 1977). “[A]t issue in a factual 12(b)(1) motion is the trial court’s jurisdietion-its very power to hear the case.... ” Id. Therefore, a trial court has an obligation to determine as a matter of law, if there is subject matter jurisdiction. While the facial attack offers the plaintiff the safeguard of requiring the court to consider the allegations of the complaint as true, the factual attack allows the court to “weigh the evidence and satisfy itself as to the existence of its power to hear the case.” Mortensen, 549 F.2d at 891. The court may consider and weigh evidence outside of the pleadings to answer the jurisdictional question. Gould Electronics Inc. v. United States, 220 F.3d 169, 178 (3d Cir. 2000) (citing Mortensen, 549 F.2d at 891). The plaintiff always bears the burden of convincing the court, by a preponderance of the evidence, that the court has jurisdiction. Id.; see also McNutt v. General Motors Acceptance Corp., 298 U.S. 178, 189, 56 S.Ct. 780, 80 L.Ed. 1135 (1936); Makarova v. United States, 201 F.3d 110, 113 (2d Cir. 2000). Here, plaintiffs argue that they have satisfied that burden and that a preponderance of the evidence establishes that the defendant is an “employer” for purposes of Title VII. They therefore claim that the defendant’s factual attack on their complaint should not have been sustained by granting the motion to dismiss.

The district court reviewed the defendant’s employment records for the 31 weeks at issue in 1999. This included the weeks of June 4, 1999 to December 31, 1999. The court concluded that there were, at most, only 13 weeks during that period when the defendant employed 15 or more employees. The court based its findings upon the testimony of several witnesses who were affiliated with Goldstein’s Deli during 1999. For example, Deborah Silinski testified that she did not begin working at the Deli until September 17, 1999, thus eliminating her as a potential employee for the weeks of June 25 through September 17. Daniel Dieffenbach, a named defendant, was correctly eliminated from consideration as an employee because he was actually the employer in the sole proprietorship. The court concluded that the testimony of Douglas Hurley and Dorothy Ciesla precluded them from being considered “employees” during significant portions of the relevant period as well, and the record supports that conclusion. 2 The court viewed Anthony Roman’s testimony in context with defendant’s check register to determine when Roman was actually paid. The court concluded that he was not an employee prior to September 17, 1999.

Finally, the court found, based on her own testimony, that Candice Karis began work in mid November of 1999. There was some testimony that defendant employed a worker named “Theresa” during the relevant period. The court correctly concluded that the record was insufficient *776 to more specifically identify her or to support a finding that she was an employee during the period in question. The court reached the same conclusion regarding an alleged employee named “Jason.” Several witnesses could neither identify him by last name nor verify when he actually worked at the Deli. 3 After the court considered all of the evidence of record it concluded that the plaintiffs had not established that defendant had the requisite number of employees for 18 weeks of the 31 weeks at issue. The record only established a period of 13 weeks when Goldstein’s Deli employed 15 or more employees. As a result, the district court concluded that the plaintiffs had failed to establish that the defendant was an “employer” for the purposes of Title VII. See 42 U.S.C. § 2000e(b), and dismissed the complaint for lack of subject matter jurisdiction.

Doe and Parrish attempt to argue that the district court erred in not presuming federal jurisdiction based upon their contention that defendant failed to properly document its employees or the hours they worked, in violation of state and federal labor statutes. They suggest that they established that defendant’s record keeping was suspiciously inadequate during the period of the alleged harassment and that this should have caused the court to draw an adverse inference in plaintiffs’ favor based on the absence of specific records. The argument has some force.

“When the contents of a document are relevant to an issue in a case, the trier of fact generally may receive the fact of the document’s nonproduction or destruction as evidence that the party that has prevented production did so out of the well-founded fear that the contents would harm him.” Brewer v. Quaker State Oil Refining Corp., 72 F.3d 326, 334 (3d Cir.l995)(citing Gumbs v. International Harvester, Inc., 718 F.2d 88, 96 (3d Cir. 1983); United States v. Cherkasky Meat Co., 259 F.2d 89 (3d Cir. 1958)). In order for this rule to apply, the evidence in question must be in the party’s control and there must have been an actual suppression or withholding of the evidence. Id. “No unfavorable inference arises when circumstances indicate that the document or article in question has been lost or accidentally destroyed, or where the failure to produce it is otherwise properly accounted for.” Id. Even assuming that the failure to keep adequate records of hourly employment constituted a violation of law, 4 there is simply no evidence to suggest that the action was taken to gain some kind of advantage. In fact, during his deposition, Daniel Dieffenbach explained that the records of hours worked were not kept for each employee because it was not necessary to do so once a payroll check was issued and the transaction was recorded in a checkbook register.

The district court was clearly critical of the defendant’s record keeping. The court remarked: “I don’t think the defense can take any great comfort in that finding, because I think the record is — is muddled and perhaps there were many records that if kept and made available would have— *777 may possibly have supported plaintiffs case, but I can’t say it would have.” App. at 930-31. We agree that impropriety in the record keeping here does not bridge the void in plaintiffs’ proof.

Finally, the plaintiffs contend that the district court erred by “holding the Appellants to a stringent standard in assessing a factual 12(b)(1) motion.” However, that argument is simply without merit. Nothing suggests that the district court adopted an incorrect standard of proof in reviewing this record. In fact, the court made clear that it was applying the preponderance of the evidence standard in concluding that the plaintiffs failed to establish that the defendant was an “employer” under Title VII. App. at 21. That is the correct standard, and plaintiffs have not established that the court’s pronouncement of that standard was other than an explanation of the standard of proof it was adopting.

III.

After a careful review of the evidence, the district court concluded that plaintiffs had not established that defendant was an “employer,” as required under Title VII. As noted above, the district court believed that the 15 employee requirement contained in the definition of “employer” was jurisdictional and therefore dismissed the complaint for lack of subject matter jurisdiction under Fed. R.Civ.P. 12(b)(1). However, we have recently held that the 15 employer requirement is an element of plaintiffs’ cause of action, rather than a jurisdictional requirement. See Nesbit v. Gears Unlimited, Inc., 347 F.3d 72, 2003 WL 22390426, (3d Cir. 2003). The district court therefore erred in concluding that it did not have subject matter jurisdiction. However, we conclude that we can affirm on other grounds. Guthrie v. Lady Jane Collieries, Inc., 722 F.2d 1141, 1145 n. 1 (3d Cir.). Because the plaintiffs did not object to the District Court’s decision to hold evidentiary hearings concerning whether Gold-stein’s was an “employer” within the meaning of 42 U.S.C. § 2000e(b), “we approach the case as if [the plaintiffs] had agreed to a bench trial of the question.” Sharpe v. Jefferson Distributing Co., 148 F.3d 676, 678 (7th Cir. 1998). Because, as noted, the District Court’s findings of fact were not clearly erroneous we will affirm the judgment of the district court based upon plaintiffs’ inability to establish an element of their Title VII cause of action.