BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 97,288	$ 8,955
Short-term investments	90,922	7,188
Accounts receivable, net of allowances of $47	6,667	3,858
Inventories	2,667	3,670
Prepaid expenses and other assets	1,734	426
Total current assets	199,278	24,097
Property and equipment, cost	1,601	1,804
Less: accumulated depreciation and amortization	(799)	(810)
Property and equipment, net	802	994
Total assets	200,080	25,091
Current liabilities:
Accounts payable	3,429	2,998
Accrued expenses	7,726	4,149
Interest	195	117
Total current liabilities	11,155	7,147
Notes payable	24,926	16,460
Preferred stock warrants	0	157
Total long-term liabilities	24,926	16,617
Total liabilities	36,081	23,764
Stockholders' equity
Preferred Stock, $0.001 par value, 10,000,000 shares and 76,894,620 shares authorized at December 31, 2018 and 2017, respectively; none and 76,235,050 shares issued and outstanding at December 31, 2018 and 2017, respectively	0	119,106
Common Stock, $0.001 par value, 200,000,000 shares and 110,000,000 shares authorized at December 31, 2018 and 2017, respectively; [X] and 1,272,360 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively	23	1
Additional paid-in capital	310,941	7,305
Accumulated other comprehensive loss	(52)	0
Accumulated deficit	(146,913)	(125,085)
Total stockholders' equity	163,999	1,327
Total liabilities and stockholders' equity	$ 200,080	$ 25,091