Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

Summary of Stock Option Activity

	Number of Shares			Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding options at December 31, 2016		1,381,843		$	14.85		4.95	$	0
Granted		430,500		$	2.291
Exercised		(0	)	$	-
Forfeited		(1,080,153	)	$	5.90
Outstanding options at December 31, 2017		732,190		$	3.72		8.17	$	56
Granted		330,000		$	2.75
Exercised		(75,022	)	$	2.46
Forfeited		(183,848	)	$	6.14
Outstanding options at December 31, 2018		803,320		$	2.89		8.43	$	54
Options vested and expected to vest		786,829		$	2.90		8.43	$	51
Exercisable at December 31, 2018		556,487		$	3.12		8.31	$	20

Summary of Additional Information Related to Options Outstanding

Option Plans Range of Exercise Prices		Number of Outstanding Options		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price
$	2.29 - $2.29		315,330		8.52	$	2.29
$	2.51-$2.52		88,105		7.37	$	2.51
$	2.56-$2.57		29,208		7.45	$	2.56
$	2.74-$2.74		300,000		9.15	$	2.74
$	2.88-$13.44		61,549		7.06	$	6.29
$	13.50-$17.67		9,128		4.62	$	16.78
			803,320

Summary of Restricted Stock Units Activity

	Number ofShares			WeightedAverageGrant-DateFair Valueper Share		WeightedAverageRemainingContractual Term (in years)		AggregateIntrinsic Value(in thousands)
Outstanding RSUs at December 31, 2016		351,921		$	4.59		1.06	$	908
Awarded		102,880		$	2.43
Released		(153,714	)	$	3.45
Forfeited		(164,758	)	$	5.78
Outstanding RSUs at December 31, 2017		136,329		$	2.80		0.80	$	329
Awarded		90,905		$	2.75
Released		(119,943	)	$	2.79
Forfeited		(11,061	)	$	2.67
Outstanding RSUs at December 31, 2018		96,230		$	2.78		0.60	$	227