CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 23,437	$ 44,583
Short-term investments	14,995	14,999
Accounts receivable, net	26,583	26,908
Prepaid expenses	7,187	6,641
Other current assets	788	922
Total current assets	72,990	94,053
Non-current assets:
Property and equipment, net	6,487	6,746
Operating lease right-of-use assets	17,367	15,821
Goodwill	99,175	99,175
Deferred income tax assets, net	32,151	31,653
Other non-current assets	706	706
Total non-current assets	155,886	154,101
Total assets	228,876	248,154
Current liabilities:
Accounts payable	4,160	5,292
Accrued compensation and benefits	11,475	13,948
Deferred revenue	25,975	25,608
Operating lease liabilities	5,150	5,405
Other current liabilities	5,091	4,745
Total current liabilities	51,851	54,998
Non-current liabilities:
Asset retirement obligations	6,490	6,355
Operating lease liabilities	13,575	11,883
Other non-current liabilities	766	1,227
Total non-current liabilities	20,831	19,465
Total liabilities	72,682	74,463
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock	0	0
Common stock	2	2
Additional paid-in capital	98,158	97,291
Accumulated other comprehensive loss	(1,792)	(1,588)
Retained earnings	59,826	77,986
Total stockholders’ equity	156,194	173,691
Total liabilities and stockholders' equity	$ 228,876	$ 248,154