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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 5,822 $ 1,963
Adjustments to reconcile net income from operations to net cash used in operating activities    
Depreciation and amortization 546 212
Loss on disposals of property, plant and equipment 26 0
Equity income in net income of affiliates (320) (148)
Unrealized loss on trading securities 1,047 0
Deferred income taxes (2,929) 35
Stock-based compensation 1,210 689
Net changes in operating assets and liabilities:    
Accounts receivable (4,602) (6,902)
Other receivables (1,850) (683)
Inventory (15,276) (931)
Prepaid expenses (83) (11)
Other long-term assets 21 36
Accounts payable 9,492 5,617
Advances from customers 14,932 195
Income tax payable 75 263
Other payables and accrued expenses 3,181 1,779
Deferred revenue 1,315 0
Other long-term liabilities (1,865) 1,715
Net cash provided by operating activities 10,742 3,829
Cash flows from investing activities:    
Purchase of property and equipment (1,466) (118)
Purchase of intangible assets (112) 0
Net cash used in investing activities (1,578) (118)
Cash flows from financing activities:    
Proceeds from short-term borrowings 4,211 2,681
Repayments of short-term borrowings (6,744) (12,415)
Repayments of long-term borrowings (224) 0
Proceeds from stock option exercise to common stock 1,377 175
Net cash used in financing activities (1,380) (9,559)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (754) (1,002)
Net increase (decrease) in cash, cash equivalents and restricted cash 7,030 (6,850)
Cash, cash equivalents and restricted cash at beginning of period 71,766 117,859
Cash, cash equivalents and restricted cash at end of period 78,796 111,009
Supplemental disclosure of cash flow information:    
Interest paid, net of capitalized interest 189 111
Cash paid for income taxes 63 0
Reconciliation of cash, cash equivalents and restricted cash in condensed consolidated statements of cash flows:    
Cash and cash equivalents 78,796 52,283
Restricted cash 0 58,726
Non-cash used in financing activities:    
Warrant conversion to common stock 0 399
Cashless exercise of stock options $ 83 $ 0