CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 67,568	$ 10,435
Short-term investments	77,373	81,345
Accounts receivable, net of allowance for doubtful accounts of $272 and $238, respectively	9,361	11,720
Inventory	5,726	5,452
Prepaid expenses and other current assets	1,936	2,510
Total current assets	161,964	111,462
Long-term investments	1,274	1,278
Property and equipment, net	4,269	3,954
Other non-current assets	312	315
TOTAL ASSETS	167,819	117,009
Current liabilities:
Accounts payable	2,577	2,811
Accrued liabilities and other	9,284	11,605
Current portion of long-term borrowings	8,731	4,358
Total current liabilities	20,592	18,774
Long-term Debt, Excluding Current Maturities	30,557	34,865
Other long-term liabilities	400	362
TOTAL LIABILITIES	51,549	54,001
Commitments and contingencies
STOCKHOLDERS’ EQUITY
Preferred stock, $0.0001 par value; 5,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.0001 par value; 100,000,000 shares authorized; 28,406,128 and 25,163,803 shares issued and outstanding, respectively	3	3
Additional paid-in capital	323,922	258,121
Accumulated other comprehensive income	697	464
Accumulated deficit	(208,352)	(195,580)
TOTAL STOCKHOLDERS’ EQUITY	116,270	63,008
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 167,819	$ 117,009