Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements ??? Adoption of ASU 2017-11 (Details)

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Fair Value Measurements – Adoption of ASU 2017-11 (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Additional Paid-in Capital $ 884,126 $ 874,697   $ 884,126 $ 874,697
Accumulated deficit (860,282) (852,199)   (860,282) (852,199)
Change in fair value of warrant liability $ (84)     $ (741)  
ASU 2017-11 | Prior to adoption          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Warrant Liability   2,917     2,917
Additional Paid-in Capital   870,457     870,457
Accumulated deficit   (850,876)     (850,876)
ASU 2017-11 | Reclassified warrant liability          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Warrant Liability   (4,240)     (4,240)
Additional Paid-in Capital   4,240     4,240
ASU 2017-11 | Reclassified unrealized gain on warrant liability          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Warrant Liability   1,323     1,323
Accumulated deficit   (1,323)     (1,323)
Change in fair value of warrant liability   $ 500 $ 1,800   $ 1,300