CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (3,429,000)	$ (21,488,000)	$ (40,363,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	5,526,000	6,218,000	6,725,000
Stock-based compensation expense	19,649,000	12,931,000	12,463,000
Amortization of acquired intangible assets	3,484,000	3,334,000	1,446,000
Amortization of costs capitalized to obtain revenue contracts	1,550,000	674,000	549,000
Loss on disposal and write-down in value of property and equipment		3,183,000	500,000
Deferred taxes	(4,000)	1,373,000	21,007,000
Other	(187,000)	147,000	(25,000)
Changes in operating assets and liabilities:
Accounts receivable	(2,143,000)	(5,980,000)	8,101,000
Prepaid expenses and other current assets	(5,787,000)	1,136,000	(433,000)
Operating lease right-of-use assets	1,821,000	1,414,000	1,193,000
Other non-current assets	2,258,000	(1,336,000)	2,069,000
Accounts payable	(1,423,000)	(86,000)	(918,000)
Accrued compensation and related benefits	7,720,000	1,264,000	1,926,000
Accrued and other liabilities	1,671,000	(648,000)	928,000
Deferred revenues	1,822,000	5,028,000	7,755,000
Billings in excess of recognized revenues	1,852,000	(1,337,000)	220,000
Operating lease liabilities	(2,082,000)	(1,584,000)	(1,360,000)
Net cash provided by (used in) operating activities	32,298,000	4,243,000	21,783,000
Cash flows from investing activities:
Proceeds from maturities and sales of short-term investments	151,500,000	171,000,000	16,500,000
Purchases of short-term investments	(58,321,000)	(168,560,000)	(131,454,000)
Purchases of property and equipment	(8,409,000)	(3,672,000)	(6,005,000)
Prepayment for the purchase of property and equipment	(21,000)	(381,000)	(963,000)
Purchases of intangible assets	150,000
Payment for business acquisition, net of cash acquired		(3,054,000)	(28,580,000)
Net cash provided by investing activities	84,599,000	(4,667,000)	(150,502,000)
Cash flows from financing activities:
Proceeds from exercise of stock options	1,686,000	1,930,000	2,570,000
Proceeds from employee stock purchase plan	3,011,000	1,035,000	1,670,000
Payments for taxes related to net share settlement of equity awards	(6,533,000)	(3,967,000)	(4,520,000)
Repurchases of common stock	(22,471,000)	(4,523,000)
Proceeds from issuance of common stock, net of issuance costs paid			65,078,000
Net cash used in financing activities	(24,307,000)	(5,525,000)	64,798,000
Effect of exchange rate changes on cash and cash equivalents	(650,000)	(182,000)	131,000
Net change in cash, cash equivalents, and restricted cash	91,940,000	(6,131,000)	(63,790,000)
Cash, cash equivalents, and restricted cash at beginning of period	27,684,000	33,815,000	97,605,000
Cash, cash equivalents, and restricted cash at end of period	119,624,000	27,684,000	33,815,000
Reconciliation of cash, cash equivalents, and restricted cash to the balance sheets:
Cash and cash equivalents	119,624,000	27,684,000	30,315,000
Restricted cash			3,500,000
Total cash, cash equivalents and restricted cash	119,624,000	27,684,000	33,815,000
Supplemental disclosure of cash flow information:
Cash paid during the period for taxes	2,850,000	1,873,000	2,707,000
Cash paid for amounts included in the measurement of operating lease liabilities	1,744,000	1,947,000	2,022,000
Supplemental disclosure of noncash information:
Property and equipment received and accrued in accounts payable and accrued and other liabilities	3,201,000	1,359,000	133,000
Advances for purchase of fixed assets transferred from prepaid assets to property and equipment	336,000	963,000
Operating lease liabilities arising from obtaining right-of-use assets	$ 2,502,000	$ 161,000	286,000
Stock-based compensation capitalized as software development costs			$ 190,000