CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 4,057	$ 3,105	$ (3,429)
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization	3,628	4,986	5,526
Stock-based compensation expense	25,047	21,484	19,649
Amortization of acquired intangible assets	3,231	3,551	3,484
Amortization of costs capitalized to obtain revenue contracts	2,674	2,142	1,550
Net accretion of discounts on short-term investments	(1,542)	(1,174)	(187)
Loss on damaged equipment in-transit, net of recovery from previously written-off equipment	586
Deferred taxes	(74)	(108)	(4)
Other	2,386	(198)
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]
Accounts receivable	(28,800)	(2,748)	(2,143)
Prepaid expenses and other current assets	(2,033)	(7,329)	(5,787)
Operating lease right-of-use assets	1,580	1,205	1,821
Other non-current assets	(3,577)	(4,166)	2,258
Accounts payable	2,791	(2,145)	(1,423)
Accrued compensation and related benefits	2,288	(2,188)	7,720
Accrued and other liabilities	1,780	110	1,671
Deferred revenues	(1,134)	(358)	1,822
Billings in excess of recognized revenues	(1,495)	(282)	1,852
Operating lease liabilities	(1,690)	(1,287)	(2,082)
Net cash provided by operating activities	9,703	14,600	32,298
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from maturities and sales of short-term investments	68,125	43,800	151,500
Purchases of short-term investments	(54,331)	(59,598)	(58,321)
Purchase of convertible promissory note	(2,000)
Proceeds from sale of property and equipment	55	105
Purchases of property and equipment	(17,155)	(11,236)	(8,409)
Prepayment for the purchase of property and equipment	(630)	(89)	(21)
Purchases of intangible assets		(150)	(150)
Payment for business acquisition, net of cash acquired		(1,823)
Net cash used in investing activities	(5,936)	(28,991)	84,599
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from exercise of stock options	123	492	1,686
Proceeds from employee stock purchase plan	4,073	3,832	3,011
Payments for taxes related to net share settlement of equity awards	(8,530)	(9,471)	(6,533)
Repurchases of common stock	(6,899)	(743)	(22,471)
Net cash used in financing activities	(11,233)	(5,890)	(24,307)
Effect of exchange rate changes on cash and cash equivalents	(918)	(365)	(650)
Net change in cash and cash equivalents	(8,384)	(20,646)	91,940
Cash and cash equivalents at beginning of period	98,978	119,624	27,684
Cash and cash equivalents at end of period	90,594	98,978	119,624
Supplemental Cash Flow Information [Abstract]
Cash paid during the year for income taxes	2,562	3,783	2,850
Cash paid for amounts included in the measurement of operating lease liabilities	1,784	1,648	1,744
Noncash Investing and Financing Items [Abstract]
Property and equipment received and accrued in accounts payable and accrued and other liabilities	7,272	1,599	3,201
Advances for purchase of fixed assets transferred from prepaid assets to property and equipment	89	66	336
Operating lease liabilities arising from obtaining right-of-use assets	718	131	$ 2,502
Property and equipment transferred to sales-type lease	7,157	8,076
Stock-based compensation capitalized as a part of the cost of property and equipment	$ 364	$ 72