Stockholders’ Equity - RSU activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) director $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 shares
Share-Based Compensation
Common stock, issued	31,996,440		31,996,440	30,549,084
Weighted-average grant date fair value (per share)
Stock-based compensation | $	$ 100		$ 436
Non-cash compensation expense not yet charged to net income | $			$ 500
Independent director
Share-Based Compensation
Number of independent directors | director		4
RSU
Number of shares
Outstanding, Beginning balance	15,000
Granted (in shares)		40,000
Vested (in shares)	(5,000)	(25,000)
Outstanding, Ending balance	10,000	15,000	10,000
Weighted-average grant date fair value
Beginning balance | $	$ 217
Granted | $		$ 580
Vested | $	(72)	(363)
Ending balance | $	$ 145	$ 217	$ 145
Weighted-average grant date fair value (per share)
Beginning balance | $ / shares	$ 14.50
Granted (in per share) | $ / shares		$ 14.50
Vested (in per share) | $ / shares	14.50	14.50
Ending balance | $ / shares	$ 14.50	$ 14.50	$ 14.50
RSU | Independent director
Share-Based Compensation
Vesting period		1 year
Number of shares
Granted (in shares)		5,000
RSUs - One-Time Award | Independent director
Share-Based Compensation
RSU award issue ratio		1
Common stock, issued		5,000
Number of shares
Granted (in shares)		5,000
RSAs
Number of shares
Granted (in shares)	25,861
Outstanding, Ending balance	25,861		25,861
Weighted-average grant date fair value
Granted | $	$ 380
Ending balance | $	$ 380		$ 380
Weighted-average grant date fair value (per share)
Granted (in per share) | $ / shares	$ 14.70
Ending balance | $ / shares	$ 14.70		$ 14.70
RSAs | Certain employees
Share-Based Compensation
Vesting period	3 years
Number of shares
Granted (in shares)	25,851