CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 121,853	$ 8,955
Short-term investments	2,107	7,188
Accounts receivable, net of allowances of $47	4,488	3,858
Inventories	3,548	3,670
Prepaid expenses and other assets	1,032	426
Total current assets	133,028	24,097
Property and equipment, cost	1,846	1,804
Less: accumulated depreciation	(981)	(810)
Property and equipment, net	865	994
Total assets	133,893	25,091
Current liabilities:
Accounts payable	2,245	2,998
Accrued expenses	4,195	4,032
Accrued interest	182	117
Current portion of notes payable	2,722
Total current liabilities	9,344	7,147
Notes payable	21,974	16,460
Preferred stock warrants		157
Total long-term liabilities	21,974	16,617
Stockholders' equity
Preferred Stock, $0.001 par value, 10,000,000 shares and 76,894,620 shares authorized at June 30, 2018 and December 31, 2017, respectively; none and 76,235,050 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively		119,106
Common Stock, $0.001 par value per share; 200,000,000 shares and 110,000,000 shares authorized at June 30, 2018 and December 31, 2017, respectively; 21,352,974 and 1,272,360 issued and outstanding at June 30, 2018 and December 31, 2017, respectively	21	1
Additional paid -in capital	239,996	7,305
Accumulated other comprehensive loss	0	0
Accumulated deficit	(137,442)	(125,085)
Total stockholders' equity	102,575	1,327
Total liabilities and stockholders' equity	$ 133,893	$ 25,091