Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 194,836	$ 23,639
Restricted cash	50	50
Accounts receivable, net	15,392	11,302
Inventories, net	5,620	3,953
Prepaid expenses and other current assets	3,866	464
Total current assets	219,764	39,408
Property and equipment, net	4,176	3,331
Restricted cash	338	338
Deposits and other assets	76	1,469
Total assets	224,354	44,546
Current liabilities
Accounts payable	2,294	2,549
Payroll-related accruals	7,223	5,225
Accrued expenses and other current liabilities	1,385	1,096
Total current liabilities	10,902	8,870
Notes payable, net	29,582	19,481
Warrant liabilities		1,169
Total liabilities	40,484	29,520
Commitments and contingencies (Note 6)
Mezzanine equity
Redeemable convertible preferred stock, par value $0.001, no shares authorized, issued, and outstanding as of June 30, 2020; 32,225,227 shares authorized, 31,968,570 shares issued and outstanding as of December 31, 2019; aggregate liquidation preference of zero as of June 30, 2020 and $54,415 as of December 31, 2019		54,170
Stockholders' equity (deficit)
Preferred stock, $0.001 par value, 10,000,000 shares authorized, no shares issued and outstanding at June 30, 2020; no shares authorized, issued, and outstanding at December 31, 2019
Common stock, $0.001 par value, 300,000,000 and 49,019,607 shares authorized as of June 30, 2020 and December 31, 2019, respectively; 48,360,081 and 6,720,767 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	48	7
Additional paid in capital	224,726	2,061
Accumulated deficit	(40,904)	(41,212)
Total stockholders' equity (deficit)	183,870	(39,144)
Total liabilities, mezzanine equity and stockholders' equity (deficit)	$ 224,354	$ 44,546