CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 47,361	$ 83,343
Short-term investments	29,899	3,963
Accounts receivable, net	30,174	32,386
Prepaid expenses	7,517	6,906
Other current assets	1,710	2,672
Inventory, net	1,004	1,708
Total current assets	117,665	130,978
Non-current assets:
Property and equipment, net	8,000	10,354
Operating lease right-of-use assets	16,317
Goodwill	124,182	133,031
Intangible assets, net	2,917	5,417
Deferred income tax assets, net	48,983	46,484
Other non-current assets	1,808	1,448
Total non-current assets	202,207	196,734
TOTAL ASSETS	319,872	327,712
Current liabilities:
Accounts payable	3,615	2,010
Accrued compensation and benefits	11,680	11,348
Accrued taxes	1,529	1,822
Deferred revenue	25,944	26,106
Operating lease liabilities	5,437
Other current liabilities	2,978	3,662
Total current liabilities	51,183	44,948
Non-current liabilities:
Asset retirement obligations	6,061	6,513
Operating lease liabilities	11,575
Other non-current liabilities	959	1,697
Total non-current liabilities	18,595	8,210
TOTAL LIABILITIES	69,778	53,158
COMMITMENTS AND CONTINGENCIES (Note 10)
STOCKHOLDERS’ EQUITY:
Preferred stock—$0.0001 par value; 25,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock—$0.0001 par value; 75,000,000 shares authorized; 19,071,614 and 19,389,066 shares issued and outstanding as of December 31, 2019 and December 31, 2018, respectively	2	2
Additional paid-in capital	86,874	90,559
Accumulated other comprehensive loss	(1,601)	(1,301)
Retained earnings	164,819	185,294
TOTAL STOCKHOLDERS’ EQUITY	250,094	274,554
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 319,872	$ 327,712