Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Schedule of Short-term Investment

Short-term investments at March 31, 2017 consist of the following:

	Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Current:
Certificates of deposit	$	22,313	$	—	$	—		$	22,313
Agency bonds		5,912		—		(6	)		5,906
United States Treasury securities		61,279		—		(66	)		61,213
	$	89,504	$	—	$	(72	)	$	89,432

Short-term investments at December 31, 2016 consist of the following:

	Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Current:
Certificates of deposit	$	22,046	$	—	$	—		$	22,046
Agency bonds		5,917		—		(4	)		5,913
United States Treasury securities		68,766		1		(51	)		68,716
	$	96,729	$	1	$	(55	)	$	96,675

Schedule of Computation of Basic and Diluted EPS

The following table sets forth the computation of basic and diluted EPS attributable to the Company’s common stockholders:

	For the Three Months Ended March 31,
	2017			2016
Numerator:
Net loss applicable to common stockholders	$	(10,670	)	$	(10,068	)
Denominator:
Weighted average common shares outstanding - basic    and diluted		26,986,318			26,423,394
Net loss per share applicable to common    stockholders - basic and diluted	$	(0.40	)	$	(0.38	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following common stock equivalents were excluded from the calculation of diluted net loss per share for the periods indicated as including them would have an anti-dilutive effect:

	Three Months Ended March 31,
	2017		2016
Shares issuable upon conversion of the 2021 Convertible    Notes		6,483,791		—
Warrants exerciseable for common stock		56,408		56,408
Stock options		2,571,819		2,400,177
Restricted Stock Units		1,341,000		—
Total		10,453,018		2,456,585