Stock-Based Compensation (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2017

Dec. 31, 2016

Stock-Based Compensation [Abstract]

Schedule of Allocation of Non-Cash Stock-Based Compensation

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
		(unaudited)				(unaudited)
Cost of revenues	$	6	$	10	$	18	$	20
Research and development		25		108		74		141
Selling, general and administrative		159		280		428		497
Total stock compensation expense	$	190	$	398	$	520	$	658

	For the Year Ended
	December 31,
	2016		2015
Cost of revenues	$	25	$	51
Research and development		164		118
Selling, general and administrative		582		437
Total stock compensation expense	$	771	$	606

Schedule of Key Assumptions of Fair Value of Stock Options Granted

	Nine Months Ended
	September 30,
	2017			2016
	(unaudited)
Dividend yield		0	%	0	%
Risk free interest rates		0.71-1.65	%	0.71-1.01	%
Expected  volatility		45.3 to 59.4	%	51.3 to 53.5	%
Expected term (in years)		3.5 to 5.0		3.5 to 5.0

		For the Year Ended
		December 31,
	2016			2015
Dividend yield		0	%		0	%
Risk free interest rates		0.71-1.41	%		0.84 – 1.56	%
Expected  volatility		49.1 to 59.4	%		51.2 to 63.9	%
Expected term (in years)		3.5 to 5.0			3.5 to 5.0

Schedule of Option Activity

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (In Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2016		5,055,741	$	3.00
Options granted (1)		498,803		2.25
Options exercised		(46,073)		1.52
Options forfeited		(50,001)		2.05
Options cancelled or expired		(316,022)		2.83
Outstanding at September 30, 2017		5,142,448	$	2.96		3.76	$	986,578
Vested or expected to vest at September 30, 2017		5,125,749	$	2.96		3.75	$	950,550
Exercisable at September 30, 2017		4,307,532	$	3.03		3.45	$	969,126

(1) The expected to vest options are the result of applying the pre-vesting forfeiture rate assumptions to total unvested options.

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (In Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2015		4,218,139	$	3.75
Options granted		1,435,097		2.45
Options exercised		(21,912)		2.10
Options forfeited		(52,781)		2.02
Options cancelled or expired		(522,802)		7.44
Outstanding at December 31, 2016		5,055,741	$	3.00		4.46	$	875,225
Vested or expected to vest at December 31, 2016 (1)		5,035,622	$	3.00		4.46	$	875,030
Exercisable at December 31, 2016		4,049,888	$	3.08		4.01	$	865,475

(1) The expected to vest options are the result of applying the pre-vesting forfeiture rate assumptions to total unvested options.