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Revenue Recognition - Cumulative Effect of ASU 2014-09 (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Apr. 01, 2018
Mar. 31, 2018
Assets:      
Accounts Receivable $ 8,055   $ 7,365
Inventory 14,006   19,780
Prepaid expenses and other current assets 4,091   2,947
Notes receivable, long term portion 2,832   2,559
Liabilities and Stockholders' Equity:      
Accounts payable and accrued expenses (17,681)   (12,625)
Deferred revenue (8,133)   (8,454)
Accumulated deficit $ (953,187)   (988,333)
Accounting Standards Update 2014-09      
Assets:      
Accounts Receivable   $ 6,687  
Inventory   18,181  
Prepaid expenses and other current assets   5,224  
Notes receivable, long term portion   2,664  
Liabilities and Stockholders' Equity:      
Accounts payable and accrued expenses   (15,354)  
Deferred revenue   (10,826)  
Accumulated deficit   $ (988,366)  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Assets:      
Accounts Receivable     (678)
Inventory     (1,599)
Prepaid expenses and other current assets     2,277
Notes receivable, long term portion     105
Liabilities and Stockholders' Equity:      
Accounts payable and accrued expenses     (2,729)
Deferred revenue     2,657
Accumulated deficit     (33)
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09      
Assets:      
Accounts Receivable     7,365
Inventory     19,780
Prepaid expenses and other current assets     2,947
Notes receivable, long term portion     2,559
Liabilities and Stockholders' Equity:      
Accounts payable and accrued expenses     (12,625)
Deferred revenue     (13,483)
Accumulated deficit     $ (988,333)