Equity - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator for basic and diluted earnings (loss) per share attributable to common stockholders:
Net (loss) income attributable to common stockholders	$ (4,317)	$ (4,689)	$ (8,564)	$ 20,533
Denominator:
Denominator for basic earnings per share—weighted average number of shares (in shares)	15,900,316	14,411,940	15,893,443	14,327,477
Effect of diluted securities (in shares)	0	0	0	200,000
Denominator for diluted earnings per share—adjusted weighted average number of shares and assumed conversions (in shares)	15,900,316	14,411,940	15,893,443	14,527,477
Basic (loss) earnings per share (in dollars per share)	$ (0.27)	$ (0.33)	$ (0.54)	$ 1.43
Diluted (loss) earnings per share (in dollars per share)	$ (0.27)	$ (0.33)	$ (0.54)	$ 1.41