CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 212,994	$ 224,073
Accounts receivable, net of allowance for doubtful accounts of $1,750	11,098	16,375
Inventory	11,178	7,918
Prepaid expenses and other current assets	3,408	4,527
Total current assets	238,678	252,893
Operating lease, right-of-use assets	4,583	5,182
Property and equipment, net	2,419	1,603
Other long-term assets	1,315	1,228
Total assets	246,995	260,906
Current liabilities:
Accounts payable	1,234	1,371
Accrued expenses	5,957	6,961
Deferred revenue	6,841	5,160
Operating lease liabilities	1,402	1,344
Total current liabilities	15,434	14,836
Long-term debt	15,000	15,000
Operating lease liabilities, net of current portion	3,797	4,508
Deferred revenue, net of current portion	11,649	11,958
Total liabilities	45,880	46,302
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued or outstanding at June 30, 2022 and December 31, 2021, respectively
Common stock, $0.001 par value; 100,000,000 shares authorized; 31,531,115 shares and 31,077,004 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	32	31
Additional paid-in capital	319,234	315,210
Accumulated deficit	(118,151)	(100,637)
Total stockholders' equity	201,115	214,604
Total liabilities and stockholders' equity	$ 246,995	$ 260,906