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 6 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Additional Paid-in Capital $ 879,639 $ 874,697 $ 879,639
Accumulated deficit (859,959) (852,199) (859,959)
Change in fair value of warrant liability $ (657)   $ (657)
ASU 2017-11 | Prior to adoption      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Warrant Liability   2,917  
Additional Paid-in Capital   870,457  
Accumulated deficit   (850,876)  
ASU 2017-11 | Reclassified warrant liability      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Warrant Liability   (4,240)  
Additional Paid-in Capital   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  
Accumulated deficit   (1,323)  
Change in fair value of warrant liability   $ 500