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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net loss $ (52,752) $ (12,443) $ (29,886)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 13,299 8,106 4,921
Non-cash lease expense 2,341    
Share-based compensation expense 27,279 12,807 2,241
Loss on sale of fixed assets 222 93 76
Amortization of debt issuance costs 256 181 109
Loss on extinguishment of debt 1,538 0 0
Change in preferred and common stock warrant liabilities 0 12,503 1,120
Net change in operating assets and liabilities:      
Accounts receivable 4,516 (27,454) (9,045)
Inventories (38,863) (51,339) (22,113)
Prepaid expenses and other assets (9,699) (2,362) 325
Accounts payable 16,027 10,149 10,455
Accrued expenses and other current liabilities (1,965) 2,743 3,798
Operating lease liabilities (2,194)    
Long-term liabilities 0 21 278
Net cash used in operating activities (39,995) (46,995) (37,721)
Cash flows used in investing activities:      
Purchases of property, plant and equipment (57,696) (23,795) (22,228)
Asset acquisition (15,482) 0 0
Proceeds from sale of fixed assets 0 0 67
Purchases of property, plant and equipment held for sale (2,288) (2,123) (1,022)
Proceeds from sale of assets held for sale 599 299 0
Payment of security deposits (33) (545) (59)
Net cash used in investing activities (74,900) (26,164) (23,242)
Cash flows from financing activities:      
Proceeds from issuance of common stock pursuant to the initial public offering, net of issuance costs 0 254,868 0
Proceeds from issuance of common stock pursuant to the secondary public offering, net of issuance costs 0 37,394 0
Proceeds from revolving credit facility 50,000 0 0
Proceeds from revolving credit line 0 0 6,000
Proceeds from term loan borrowing 0 0 20,000
Proceeds from equipment loan borrowing 0 0 5,000
Proceeds from payoff of notes receivable for restricted stock purchase 0 0 951
Debt issuance costs (1,224) 0 (437)
Debt extinguishment costs (1,200) 0 0
Repayments on revolving credit facility (25,000) 0 0
Repayments on revolving credit line (6,000) 0 (2,500)
Repayment on term loan (20,000) 0 (1,000)
Repayment of equipment loan (5,000) 0 0
Repayment of Missouri Note 0 0 (1,450)
Principal payments under finance lease obligations (70)    
Principal payments under finance lease obligations   (55) (153)
Proceeds from exercise of stock options 9,007 2,669 1,369
Proceeds from restricted stock exercise 0 0 2
Payments of minimum withholding taxes on net share settlement of equity awards (2,275) 0 0
Payments of deferred offering costs 0 0 (2,415)
Payment for repurchase of common stock 0 0 (514)
Net cash (used in) provided by financing activities (1,762) 294,876 76,199
Net (decrease) increase in cash and cash equivalents (116,657) 221,717 15,236
Cash and cash equivalents at the beginning of the period 275,988 54,271 39,035
Effect of exchange rate changes on cash (204) 0 0
Cash and cash equivalents at the end of the period 159,127 275,988 54,271
Cash paid during the period for:      
Interest 2,564 3,019 924
Taxes 18 9 4
Non-cash investing and financing activities:      
Finance lease obligations for the purchase of property, plant and equipment 0 225 85
Issuance of convertible preferred stock warrants in connection with debt 0 0 248
Non-cash additions to property, plant and equipment 10,719 1,418 1,146
Offering costs, accrued not yet paid 0 0 745
Operating lease right-of-use assets obtained in exchange for lease liabilities 4,706    
Note receivable from sale of assets held for sale 4,558 0 0
Reclassification of warrant liability to additional paid-in capital in connection with the initial public offering 0 14,421 0
Conversion of convertible preferred stock to common stock upon initial public offering 0 199,540 0
Series H      
Cash flows from financing activities:      
Proceeds from preferred stock offering, net of offering costs 0 0 49,999
Series G      
Cash flows from financing activities:      
Proceeds from preferred stock offering, net of offering costs $ 0 $ 0 $ 1,347