Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Schedule of assumptions used for fair value of warrants

The fair value of the warrants was based on the following assumptions using the Black-Scholes option-pricing model:

	Year Ended December 31,
	2016					2015					2014
Risk-free interest rate	1.13	%	to	1.98	%	1.51	%	to	2.03	%	0.02	%	to	2.33	%
Contractual life (years)	5.3		to	6.3		6.3		to	7.2		0.3		to	8.0
Expected volatility	46.7	%	to	48.8	%	47.8	%	to	54.2	%	48.5	%	to	57.5	%
Dividend yield	—					—					—

Schedule of reserve for unissued shares of common stock

The amount of such shares of the Company’s common stock reserved for these purposes at December 31, 2016 is as follows:

	Number of Shares
Outstanding stock options	24,541,512
Outstanding restricted stock units	4,339,320
Outstanding common stock warrants	1,458,979
Additional shares available for grant under equity plan	3,254,115
Total	33,593,926