Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Summary of Outstanding Warrants Issued By Company

Below is a summary of outstanding warrants issued by the Company as of December 31, 2015:

Warrant Type	Shares Issuable Pursuant to the Exercise of Warrants		Weighted Average Exercise Price		Issue Date	Expiration Date
Consultant Warrant		85,000	$	10.70	August 13, 2014	August 13, 2019
Opus Warrant		100,000		9.90	March 31, 2014	March 31, 2019
2013 Private Placement Warrants		186,878		10.00	August 14, 2013	August 14, 2017
Total		371,878

Summary of Activity under Stock-Based Compensation Plans

A summary of activity for the Company’s stock option plans for the year ended December 31, 2015 follows:

	Number Outstanding			Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)		Average Intrinsic Value
Balance at December 31, 2014		897,115		$	12.09
Granted		—			—
Cancelled or expired		(110,131	)		16.64
Exercised		(5,180	)		8.01
Balance at December 31, 2015		781,804		$	11.48	6.72		$	-
Vested or expected to vest at    December 31, 2015		744,258		$	11.59		6.54	$	-
Exercisable at December 31,    2015		495,206		$	12.88	5.85		$	-

Summary Information about Options Outstanding

The following table summarizes information about options outstanding as of December 31, 2015:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$5.20 - $8.40		158,222		7.59	$	6.40		100,345	$	6.64
$8.41 - $8.80		230,688		7.84		8.80		106,382		8.80
$8.81 - $12.00		247,769		6.80		11.21		147,229		11.41
$12.01 - $40.20		140,775		3.39		21.06		136,900		21.24
$40.21 - $43.40		4,350		1.22		43.38		4,350		43.38
$5.20 - $43.40		781,804		6.63		11.48		495,206		12.88

Weighted-average Assumptions Used in Estimating Fair Value of Option Grants by Using Black-Scholes-Merton Model

The fair value of option grants was estimated using the Black-Scholes-Merton model with the following weighted-average assumptions for the years ended December 31:

	2015	2014
Risk-free interest rate	N/A		1.54	%
Expected volatility	N/A		88.7	%
Expected term in years	N/A		4.79
Dividend yield	N/A	None

Summary of Restricted Stock Unit Activity

The following is a summary of restricted stock and RSU activity for the year ended December 31, 2015:

	Number Outstanding			Weighted Average Fair Value		Weighted Average Remaining Contractual Term (Years)	Average Intrinsic Value
Balance at December 31, 2014		542,342		$	13.74
Granted		285,247			12.34
Vested		(52,421	)		14.53
Forfeited		(53,250	)		11.17
Balance at December 31, 2015		721,918		$	13.32	1.3	$	1,436,619

Stock-Based Compensation Expense

The following table illustrates all stock-based compensation expense related to the ESPP, stock options and RSUs included in the consolidated statements of operations for the years ended December 31, 2015 and 2014 (in thousands):

	Year Ended
	December 31,
	2015		2014
Cost of revenue	$	85	$	36
Research and development		324		142
Selling and marketing		1,085		303
General and administrative		3,022		1,396
Total	$	4,516	$	1,877

Summary of Common Stock Reserved For Future Issuance

Common stock reserved for future issuance as of December 31, 2015 was as follows:

Exercise of outstanding stock options and vesting of RSUs	1,503,722
ESPP	293,888
Shares of common stock available for grant under the 2011 Plan	218,244
Noncontrolling interest in Bluehill AG	10,355
Warrants to purchase common stock	741,047
Total	2,767,256