Net Income (Loss) per Common Share (Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share Reconciliation [Abstract]
Net loss	$ (7,292)	$ (1,086)	$ (970)	$ (2,940)	$ (10,871)	$ (2,004)	$ (3,600)	$ (3,651)	$ (12,288)	$ (20,126)	$ (32,061)
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Weighted-average common shares outstanding (shares)	28,310,000	28,259,000	28,172,000	27,886,000	27,759,000	27,672,000	27,598,000	27,482,000	28,156,382	27,627,693	22,353,419
Weighted-average common shares and share equivalents outstanding (shares)	28,310,000	28,259,000	28,172,000	27,886,000	27,759,000	27,672,000	27,598,000	27,482,000	28,156,382	27,627,693	22,353,419
Net loss per common share:
Basic (usd per share)	$ (0.26)	$ (0.04)	$ (0.03)	$ (0.11)	$ (0.39)	$ (0.07)	$ (0.13)	$ (0.13)	$ (0.44)	$ (0.73)	$ (1.43)
Diluted (usd per share)	$ (0.26)	$ (0.04)	$ (0.03)	$ (0.11)	$ (0.39)	$ (0.07)	$ (0.13)	$ (0.13)	$ (0.44)	$ (0.73)	$ (1.43)