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Revenue Recognition - Cumulative Effect of ASU 2014-09 (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net $ 7,622   $ 7,365
Inventory 16,235   19,780
Prepaid expenses and other current assets 3,339   2,947
Notes receivable, long term portion 2,776   2,559
Accounts payable and accrued expenses (15,304)   (12,625)
Deferred revenue (7,891)   (8,454)
Accumulated deficit $ (970,479)   (988,333)
Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net   $ 6,687  
Inventory   18,181  
Prepaid expenses and other current assets   5,224  
Notes receivable, long term portion   2,664  
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      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net     (678)
Inventory     (1,599)
Prepaid expenses and other current assets     2,277
Notes receivable, long term portion     105
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      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net     7,365
Inventory     19,780
Prepaid expenses and other current assets     2,947
Notes receivable, long term portion     2,559
Accounts payable and accrued expenses     (12,625)
Deferred revenue     (13,483)
Accumulated deficit     $ (988,333)