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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (12,916,000) $ (9,322,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Interest expense on Mann Group promissory notes 1,028,000 1,257,000
Stock-based compensation expense 1,935,000 1,128,000
Asset impairment   1,521,000
Depreciation, amortization and accretion 655,000 538,000
Amortization of right-of-use assets 309,000 282,000
Write-off of inventory 0 496,000
Gain on foreign currency translation (3,838,000) (1,796,000)
Other, net   19,000
Changes in operating assets and liabilities:    
Accounts receivable, net 645,000 (1,661,000)
Inventory (77,000) 428,000
Prepaid expenses and other current assets 356,000 988,000
Other assets (97,000) 40,000
Accounts payable 1,124,000 1,942,000
Accrued expenses and other current liabilities 8,288,000 1,880,000
Deferred revenue (7,431,000) (8,235,000)
Operating lease liabilities (333,000) (724,000)
Recognized loss on purchase commitments (2,379,000)  
Net cash used in operating activities (12,731,000) (11,219,000)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of debt securities (30,442,000)  
Purchase of property and equipment (976,000) (150,000)
Proceeds from sale of treasury bills   20,000,000
Net cash (used in) provided by investing activities (31,418,000) 19,850,000
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from the Senior convertible notes 230,000,000  
Issuance costs associated with Senior convertible notes (7,268,000)  
Payment of employment taxes related to vested restricted stock units and exercise of stock options 397,000 (317,000)
Net cash provided by financing activities 224,977,000 331,000
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 180,828,000 8,962,000
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 67,163,000 30,222,000
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 247,991,000 39,184,000
SUPPLEMENTAL CASH FLOWS DISCLOSURES:    
Interest paid in cash, net of amounts capitalized 1,094,000 885,000
NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Reclassification of the PPP Loan from current to long-term 609,000  
Payment of interest through common stock issuance 143,000 144,000
Common stock issuance to settle employee stock purchase plan liability 390,000 318,000
Non-cash construction in progress and property and equipment 124,000 32,000
2024 Convertible Notes    
NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Payment of 2024 convertible notes through common stock issuance 5,000,000  
Mann Group    
NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Payment of convertible notes through common stock issuance 9,573,000  
Payment of interest through common stock issuance 427,000  
At The Market Issuance    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from at-the-market offering 1,886,000 668,000
Issuance costs associated with at-the-market offering $ (38,000) $ (20,000)