CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 37,364	$ 53,581
Short-term investments	147,687	142,851
Accounts receivable, net of allowance for doubtful accounts of $263	13,088	13,611
Inventory	7,408	5,633
Prepaid expenses and other current assets	2,563	2,565
Total current assets	208,110	218,241
Property and equipment, net	7,285	4,527
Other non-current assets	366	374
TOTAL ASSETS	215,761	223,142
Current liabilities:
Accounts payable	5,183	3,271
Accrued liabilities and other	8,525	10,199
Total current liabilities	13,708	13,470
Long-term borrowings	39,543	39,455
Other long-term liabilities	843	854
TOTAL LIABILITIES	54,094	53,779
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; 32,808,534 and 32,583,220 shares issued and outstanding, respectively	3	3
Additional paid-in capital	412,753	408,113
Accumulated other comprehensive income	430	524
Accumulated deficit	(251,519)	(239,277)
TOTAL STOCKHOLDERS’ EQUITY	161,667	169,363
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 215,761	$ 223,142