Organization and Summary of Significant Accounting Policies - Summary of Effect of Restatement on Previously Reported Unaudited Condensed Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss		$ (7,586)	$ (23,225)
Adjustments to reconcile net loss to net cash provided by used in operating activities:
Depreciation and amortization		1,081	1,265
Impairment of long-lived assets and non-cash restructuring			4,443
Amortization of deferred financing costs			12
Stock-based compensation		2,671	1,352
Provision for inventory write-down		705	666
Provision for credit losses, net of recoveries		(752)	14,228
Provision for sales returns		1,448	239
Provision for warranty		121	269
Unrealized loss (gain) on foreign currency transactions		874	(883)
Subsidiary dissolution		(68)
Deferred taxes			(134)
Changes in operating assets and liabilities excluding effects of acquisition:
Accounts receivable		6,418	(846)
Other receivable		126	(2,678)
Inventories		(14,557)	(3,239)
Contract assets		1,261	(267)
Prepaid expenses and other assets		(4,557)	(1,186)
Accounts payable		1,586	3,539
Contract liabilities		(43)	32
Accrued and other liabilities		540	(523)
Net cash used in operating activities		(10,732)	(6,936)
Cash flows from investing activities:
Purchases of property, plant and equipment		(1,317)	(1,266)
Acquisition of business, net of cash acquired			(4,258)
Net cash used in investing activities		(1,317)	(5,524)
Cash flows from financing activities:
Proceeds from issuance of common stock in public offerings, net of issuance costs			59,525
Repayments of short-term borrowings and line of credit			(11,494)
Repayments of related party term loan			(29,298)
Payments for debt issue costs		(178)
Proceeds from exercise of stock awards and employee stock plan purchases		156	2,569
Net cash provided by (used in) financing activities		(22)	21,302
Effect of exchange rate changes on cash, cash equivalents and restricted cash		(903)	404
Net increase (decrease) in cash, cash equivalents and restricted cash		(12,974)	9,246
Cash, cash equivalents and restricted cash at beginning of period		53,639	54,587
Cash, cash equivalents and restricted cash at end of period		40,665	$ 63,833
As Previously Reported
Cash flows from operating activities:
Net loss		(3,048)
Adjustments to reconcile net loss to net cash provided by used in operating activities:
Depreciation and amortization		1,081
Stock-based compensation		2,671
Provision for inventory write-down		705
Provision for credit losses, net of recoveries		(752)
Provision for sales returns		1,448
Provision for warranty		121
Unrealized loss (gain) on foreign currency transactions		874
Subsidiary dissolution		(68)
Changes in operating assets and liabilities excluding effects of acquisition:
Accounts receivable		2,761
Other receivable		126
Inventories		(10,931)
Contract assets		1,261
Prepaid expenses and other assets		(7,577)
Accounts payable		1,586
Contract liabilities		(1,446)
Accrued and other liabilities		456
Net cash used in operating activities		(10,732)
Cash flows from investing activities:
Purchases of property, plant and equipment		(1,317)
Net cash used in investing activities		(1,317)
Cash flows from financing activities:
Payments for debt issue costs		(178)
Proceeds from exercise of stock awards and employee stock plan purchases		156
Net cash provided by (used in) financing activities		(22)
Effect of exchange rate changes on cash, cash equivalents and restricted cash		(903)
Net increase (decrease) in cash, cash equivalents and restricted cash		(12,974)
Cash, cash equivalents and restricted cash at beginning of period		53,639
Cash, cash equivalents and restricted cash at end of period		40,665
Adjustments
Cash flows from operating activities:
Net loss	[1],[2]	(4,538)
Changes in operating assets and liabilities excluding effects of acquisition:
Accounts receivable	[1]	3,657
Inventories	[1]	(3,626)
Prepaid expenses and other assets	[2]	3,020
Contract liabilities	[1]	1,403
Accrued and other liabilities	[2]	$ 84

[1] Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

[2] Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.