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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Cash flows from operating activities          
Net income (loss) $ 1,262   $ (30,324)    
Adjustments to reconcile net loss to net cash used in operating activities          
Gain from Continuation Advances (34,000)       $ (18,000)
Depreciation 1,657   1,796    
Amortization of operating lease right-of-use assets 709   653    
Amortization of debt discount and financing costs 129   279    
Gain on derivative     (16)    
Stock-based compensation 4,032   4,381    
Amortization (accretion) from investment premium (discount) (83)   (416)    
Changes in assets and liabilities          
Accounts receivable 7,909   1,316    
Inventory (3,374)   (1,888)    
Prepaid expenses and other assets (58)   87    
Accounts payable (4,129)   2,075    
Accrued expenses 4,721   (1,703)    
Deferred revenue (970)   (230)    
Operating lease liabilities (931)        
Other liabilities 489   (1,323)    
Deferred gain from Reverse Termination fee 98,000        
Net cash provided by (used in) operating activities 75,363   (25,313)    
Cash flows from investing activities          
Purchase of property and equipment (117)   (1,253)    
Purchase of investments (72,960)   (17,623)    
Sales of investments      
Maturities of investments 18,750   56,860    
Net cash provided by (used in) investing activities (54,327)   37,984    
Cash flows from financing activities          
Proceeds from Continuation Advances 34,000 $ 18,000   $ 52,000  
Notes payable principal payoff (16,000)        
Proceeds from issuance of common stock from equity plans 199   6,690    
Net cash provided by financing activities 18,199   6,690    
Net increase in cash and cash equivalents and restricted cash 39,235   19,361    
Cash and cash equivalents and restricted cash at beginning of period 33,627   23,344   23,344
Cash and cash equivalents and restricted cash at end of period 72,862 33,627 42,705 72,862 33,627
Cash and cash equivalents at end of period 68,862 $ 29,627 38,205 68,862 $ 29,627
Restricted cash at end of period $ 4,000   $ 4,500 $ 4,000