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Condensed Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (30,829,000) $ (37,640,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Interest expense on promissory notes 3,852,000 3,517,000
Stock-based compensation expense 4,607,000 5,312,000
Asset impairment 1,889,000  
Depreciation, amortization and accretion 1,639,000 407,000
Amortization of right-of-use assets 879,000 903,000
Write-off of inventory 496,000 0
Loss (gain) on foreign currency translation 3,998,000 (4,495,000)
Payment-in-kind interest on promissory notes   (32,822,000)
Gain on extinguishment of debt   (3,529,000)
Other, net 19,000 103,000
Changes in operating assets and liabilities:    
Accounts receivable, net (622,000) (76,000)
Inventory (1,222,000) (95,000)
Prepaid expenses and other current assets (1,306,000) (1,028,000)
Other assets 191,000 (356,000)
Accounts payable 1,008,000 6,282,000
Accrued expenses and other current liabilities 641,000 (134,000)
Deferred revenue (10,281,000) (12,721,000)
Operating lease liabilities (2,087,000) (1,064,000)
Recognized loss on purchase commitments (1,235,000) (4,395,000)
Accrued interest on promissory notes   (1,545,000)
Net cash used in operating activities (28,363,000) (83,376,000)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from sale of treasury bills 20,000,000 24,995,000
Purchase of property and equipment (304,000) (2,456,000)
Purchase of treasury bills   (44,880,000)
Purchase of limited liability company ownership interest   (300,000)
Net cash provided by (used in) investing activities 19,696,000 (22,641,000)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Issuance of common stock from the exercise of warrants 11,600,000  
Proceeds from Paycheck Protection Program loan 4,873,000  
Payment of employment taxes related to vested restricted stock units and exercise of stock options (99,000) 50,000
Proceeds from market price stock purchase plan 14,000  
Proceeds from promissory notes   70,051,000
Proceeds from MidCap Credit Facility   40,000,000
Proceeds from senior convertible notes   9,910,000
Principal payments on promissory notes   (38,264,000)
Principal payments on senior convertible notes   (11,081,000)
Principal payments on facility financing obligation   (6,920,000)
Issuance cost associated with MidCap Credit Facility   (886,000)
Issuance cost associated with promissory notes   (33,000)
Net cash provided by (used in) financing activities 31,159,000 64,822,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 22,492,000 (41,195,000)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 30,222,000 71,684,000
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 52,714,000 30,489,000
SUPPLEMENTAL CASH FLOWS DISCLOSURES:    
Interest paid in cash, net of amounts capitalized 2,861,000  
NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Payment of principal on senior convertible notes through common stock issuance 2,630,000 4,500,000
Receivable from at the market offering 574,000  
Common stock issuance to settle employee stock purchase plan liability 684,000 656,000
Payment of interest on senior convertible notes through common stock issuance 288,000 1,075,000
Payment on promissory notes through issuance of common stock   8,000,000
Addition of right-of-use assets upon adoption of new lease guidance   5,192,000
Payment of facility obligation through common stock issuance   4,575,000
Non-cash construction in progress and property and equipment   203,000
At The Market Issuance    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from at the market offering 15,139,000 2,042,000
Issuance costs associated with at the market offering $ (368,000) $ (47,000)