Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income (loss) available for common shareholders	$ (6,141)	$ 289	$ (23,199)	$ (15,302)
Denominator:
Weighted-average common shares outstanding - basic	114,874	93,073	107,953	84,388
Dilutive incremental share effect from:
Options	0	1	0	0
Nonvested restricted stock units	0	130	0	0
Weighted-average shares outstanding - diluted	114,874	93,204	107,953	84,388
Net income (loss) per share - basic	$ (0.05)	$ 0.00	$ (0.21)	$ (0.18)
Net income (loss) per share - diluted	$ (0.05)	$ 0.00	$ (0.21)	$ (0.18)