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Restatement of Previously Issued Consolidated Financial Statements - Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net loss $ (10,751) $ (22,391) $ (41,897)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Provision for doubtful accounts and sales returns 1,147 1,579 2,531
Changes in operating assets and liabilities:      
Accounts receivable, net 12,362 (8,724) (2,952)
Inventory (4,669) 479 (796)
Prepaid expenses and other assets (2,399) (180) (405)
Deferred revenue 3,018 19,609 14,788
Net cash provided by operating activities $ 14,314 18,778 3,391
As Previously Reported      
Cash flows from operating activities:      
Net loss   (20,940) (40,034)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Provision for doubtful accounts and sales returns   1,731  
Changes in operating assets and liabilities:      
Accounts receivable, net   (11,319) (5,977)
Inventory   892 (430)
Prepaid expenses and other assets   (96)  
Deferred revenue   20,104 15,584
Net cash provided by operating activities   18,778 3,391
Revenue Recognition Adjustments      
Cash flows from operating activities:      
Net loss   (1,451) (1,863)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Provision for doubtful accounts and sales returns   (152)  
Changes in operating assets and liabilities:      
Accounts receivable, net   2,595 3,025
Inventory   (413) (366)
Prepaid expenses and other assets   (84)  
Deferred revenue   (495) (796)
Net cash provided by operating activities   $ 0 $ 0