Stockholders' Equity - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 20, 2017	Apr. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized and reserved for issuance (in shares)		4,000,000.0
Maximum shares of common stock authorized for issuance under stock option plan (in shares)		9,500,000.0					5,500,000.0
Weighted average grant date fair value (in dollars per share)			$ 1.94	$ 0.94	$ 1.94	$ 0.94
Increase in treasury shares (in shares)					33,000
Proceeds from issuance of warrants	$ 1,500,000				$ 1,500,000	$ 0
Number of securities called by warrants (in shares)	1,500,000
Exercise price of warrants (in dollars per share)	$ 5.00
Treasury stock acquired (in shares)	419,000
Cost per share (in dollars per share)	$ 3.60
Value of treasury stock acquired	$ 1,500,000
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase shares outstanding under share based compensation (in shares)			2,481,542		2,481,542			861,366
Options exercised in period (in shares)					0	0
Unrecognized compensation cost			$ 3,400,000		$ 3,400,000
Expected weighted-average period for recognized compensation cost					1 year 6 months
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost			10,500,000		$ 10,500,000
Expected weighted-average period for recognized compensation cost					2 years 2 months 12 days
General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			34,000	$ 11,000	$ 69,000	$ 11,000
General and Administrative Expenses | Habits at Work
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				313,000	(57,000)	617,000
General and Administrative Expenses | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 1,300,000	$ 1,100,000	$ 2,400,000	$ 2,000,000
2014 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining to be granted under stock option plan (in shares)			3,713,000		3,713,000
Options to purchase shares outstanding under share based compensation (in shares)			5,700,000		5,700,000