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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options exercised			0		0
Proceeds from exercise of stock options			$ 0		$ 0
Issuance of common stock for services (Shares)			75,183	46,858	75,183	46,858
Issuance of common stock for services, amount			$ 300	$ 200	$ 300	$ 200
Options to Purchase Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock based compensation expense			14,500		$ 14,500
Unrecognized stock based compensation expense, weighted-average remaining recognition period					2 years 8 months 12 days
Number of options exercised				9,025		28,326
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock based compensation expense			$ 1,600		$ 1,600
Unrecognized stock based compensation expense, weighted-average remaining recognition period					1 year
Number of shares issued upon vesting of restricted stock units			0	0	0	15,188
Performance-Based Restricted Stock Units (PRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vested shares			0	0	0	0
Recognized stock-based compensation related expense in connection with vesting of award granted			$ 300		$ 400
Unrecognized stock based compensation expense			300		$ 300
Unrecognized stock based compensation expense, weighted-average remaining recognition period					3 months 18 days
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock based compensation expense			$ 100		$ 100
Unrecognized stock based compensation expense, weighted-average remaining recognition period					2 months 12 days
Number of shares issued under ESPP	68,589	42,845
Purchase price	$ 4.38	$ 8.77
Proceeds	$ 300	$ 400

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Unrecognized cost of unvested share-based compensation awards.

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