Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 112,277	$ 24,990
Accounts receivable, net	6,932	4,520
Inventories	9,275	5,744
Prepaid expenses and other current assets	3,503	1,408
Total current assets	131,987	36,662
Property and equipment, net	2,697	2,880
Restricted cash	310	310
Other non-current assets	3,575	1,029
Total assets	138,569	40,881
Current liabilities:
Accounts payable	1,965	1,252
Accrued liabilities	10,476	7,586
Total current liabilities	12,441	8,838
Long-term debt	44,785	44,201
Redeemable convertible preferred stock warrant liability	0	16,091
Other liabilities	3,900	1,069
Total liabilities	61,126	70,199
Commitments and contingencies (Note 7)
Redeemable convertible preferred stock issuable in series, $0.001 par value
Liquidation preference: None and $121,144 at September 30, 2019 and December 31, 2018, respectively	0	105,235
Preferred stock, $0.001 par value
Shares issued and outstanding: none	0	0
Common stock, $0.001 par value
Shares issued and outstanding: 30,775,980 and 1,135,310 at September 30, 2019 and December 31, 2018, respectively	31	1
Additional paid-in capital	260,647	4,557
Accumulated deficit	(183,235)	(139,111)
Total stockholders' equity (deficit)	77,443	(134,553)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit)	$ 138,569	$ 40,881