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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016 as follows:
 
December 31,
  
2017
 
2016
Common stock warrants outstanding
1,886,630

 
1,886,630

Stock options outstanding
6,566,483

 
6,356,203

Restricted stock units outstanding
1,055,977

 
2,975,800

Shares available for issuance pursuant to Convertible Notes
40,649,225

 
30,000,000

Shares available for future grants of awards under the 2015 Incentive Compensation Plan
1,973,537

 
1,332,035

Shares available for future grants of awards under the 2009 Omnibus Incentive Compensation Plan
3,816,243

 
3,871,666

Shares available under the 2000 Employee Stock Purchase Plan
857,638

 
89,676

Total shares of common stock reserved for issuance
56,805,733

 
46,512,010