Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 275,988	$ 54,271
Accounts receivable	40,080	12,626
Inventory	81,596	30,257
Prepaid expenses and other current assets	5,930	5,672
Total current assets	403,594	102,826
Property, plant, and equipment, net	47,474	30,527
Other non-current assets, net	855	396
Total assets	451,923	133,749
Current liabilities:
Accounts payable	26,923	17,247
Wages payable	1,768	1,255
Accrued bonus	4,129	2,312
Accrued expenses and other current liabilities	3,805	2,391
Short-term borrowings under revolving credit line and bank term loan	11,000	0
Short-term capital lease liabilities	72	44
Stock warrant liability	0	1,918
Total current liabilities	47,697	25,167
Long-term liabilities:
Revolving credit line	0	6,000
Long-term portion of bank term loan, net	14,637	19,388
Equipment loan, net	4,932	5,000
Capital lease obligations and other long-term liabilities	567	404
Total long-term liabilities	20,136	30,792
Commitments and Contingencies (Note 9)
Convertible preferred stock:
Convertible preferred stock		199,540
Stockholders’ equity (deficit):
Preferred stock, par value $0.0001 per share—500,000 shares authorized, none issued and outstanding	0	0
Common stock, par value $0.0001 per share—500,000,000 shares and 58,669,600 shares authorized at December 31, 2019 and 2018, respectively; 61,576,494 and 6,951,350 shares issued and outstanding at December 31, 2019 and 2018, respectively	6	1
Additional paid-in capital	526,199	7,921
Accumulated deficit	(142,115)	(129,672)
Total stockholders’ equity (deficit)	384,090	(121,750)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	451,923	133,749
Series A
Convertible preferred stock:
Convertible preferred stock	0	2,000
Series B
Convertible preferred stock:
Convertible preferred stock	0	4,999
Series C
Convertible preferred stock:
Convertible preferred stock	0	14,882
Series D
Convertible preferred stock:
Convertible preferred stock	0	24,948
Series E
Convertible preferred stock:
Convertible preferred stock	0	17,214
Series F
Convertible preferred stock:
Convertible preferred stock	0	29,840
Series G
Convertible preferred stock:
Convertible preferred stock	0	55,658
Series H
Convertible preferred stock:
Convertible preferred stock	$ 0	$ 49,999