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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Summary of Common Shares Reserved for Future Issuance

The Company had reserved shares of common stock for possible future issuance as of December 31, 2018 and 2017 as follows:

	December 31,
	2018			2017
Common stock warrants outstanding	5,815,283			1,886,630
Stock options outstanding	8,796,212			6,566,483
Restricted stock units outstanding	454,382			1,055,977
Shares available for issuance pursuant to Convertible Notes	40,649,225			40,649,225
Shares available for future grants of awards under the 2015 Incentive Compensation Plan	1,943,085			1,973,537
Shares available for future grants of awards under the 2018 Omnibus Incentive Compensation Plan	3,224,425			3,816,243
Shares available under the 2000 Employee Stock Purchase Plan	825,537			857,638
Total shares of common stock reserved for issuance	61,708,149			56,805,733

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