Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Assumptions for Fair Value of Stock Options

The fair value of the employee stock options granted during the period was estimated on the respective grant date using a Black-Scholes option-pricing model with the following weighted-average assumptions: 

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Expected term (in years)		6.1			6.1			6.0			6.0
Risk-free interest rate		2.0	%		1.3	%		2.1	%		1.3	%
Expected volatility		54	%		55	%		55	%		54	%
Expected dividend rate		—	%		—	%		—	%		—	%

Schedule of Stock-based Compensation Expense, Net of Estimated Forfeitures

Stock-based compensation expense, net of estimated forfeitures, was included in the following line items on the Condensed Consolidated Statements of Operations (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Cost of revenue	$	38	$	101	$	144	$	408
Research and development		61		223		306		759
Sales and marketing		28		178		97		568
General and administrative		115		384		674		1,201
Total stock-based compensation	$	242	$	886	$	1,221	$	2,936

Schedule of Stock-based Compensation Expense, Net of Estimated Forfeitures, by Grant Type

The following table presents stock-based compensation expense, net of estimated forfeitures, by grant type (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Stock options	$	197	$	770	$	1,095	$	2,518
Restricted stock awards and restricted stock units (RSUs)		45		116		126		418
Total stock-based compensation	$	242	$	886	$	1,221	$	2,936

Schedule of Unrecognized Compensation Expense, Net of Forfeitures, Expected to be Recognized Over Weighted-average Periods

The following table presents unrecognized compensation expense, net of estimated forfeitures, related to the Company’s equity compensation plans as of September 30, 2017, which is expected to be recognized over the following weighted-average periods (in thousands, except for weighted-average period): 

	Unrecognized		Weighted-
	Compensation		Average Period
	Expense		(in years)
Stock options	$	1,218		2.9
RSUs	$	280		2.4

Schedule of Grants Made by Entity

The following table presents details on grants made by the Company for the following periods: 

	Nine Months Ended				Nine Months Ended
	September 30, 2017				September 30, 2016
			Weighted-				Weighted-
			Average Grant				Average Grant
	Shares Granted		Date Fair Value		Shares Granted		Date Fair Value
Stock options		1,893,500	$	1.03		2,285,000	$	0.69
RSUs		300,000	$	0.96		200,000	$	0.99

Schedule of Reserved Shares of Common Stock

As of September 30, 2017 and December 31, 2016, the Company had reserved shares of common stock for issuance as follows:

	As of September 30, 2017		As of December 31, 2016
Number of stock options outstanding		7,635,846		10,048,607
Number of RSUs outstanding		524,765		323,663
Shares available for future grant		9,556,981		5,163,386
Total shares reserved		17,717,592		15,535,656