Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 56,514	$ 20,462
Short-term investments	65,256	120,089
Accounts receivable, net of allowances for doubtful accounts of $11,840 and $9,049 as of March 31, 2020 and December 31, 2019, respectively	24,211	23,867
Inventory	4,227	4,037
Prepaid expenses and other current assets	4,223	4,337
Total current assets	154,431	172,792
Long-term investments	0	8,030
Property and equipment, net	28,454	26,464
Operating lease right-of-use assets	89,249	90,124
Goodwill	862	862
Other assets	9,944	7,940
Total assets	282,940	306,212
Current liabilities:
Accounts payable	5,544	8,243
Accrued liabilities	23,247	32,714
Deferred revenue	1,115	1,251
Debt, current portion	4,861	1,944
Operating lease liabilities, current portion	8,078	7,914
Total current liabilities	42,845	52,066
Debt, noncurrent portion	30,076	32,989
Operating lease liabilities, noncurrent portion	85,042	85,748
Total liabilities	157,963	170,803
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock, $0.001 par value – 5,000,000 shares authorized at March 31, 2020 and December 31, 2019; and none issued and outstanding at March 31, 2020  and December 31, 2019	0	0
Common stock, $0.001 par value – 100,000,000 shares authorized at March 31, 2020 and December 31, 2019; 27,026,975 and 26,682,720 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	25	25
Additional paid-in capital	394,507	395,695
Accumulated other comprehensive income	364	82
Accumulated deficit	(269,919)	(260,393)
Total stockholders’ equity	124,977	135,409
Total liabilities and stockholders’ equity	$ 282,940	$ 306,212
Preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	27,026,975	26,682,720
Common stock, shares outstanding (in shares)	27,026,975	26,682,720
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares issued (in shares)	0	0