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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Cash flows from operating activities:    
Net loss $ (23,503,057) $ (17,876,600)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 1,878,363 949,854
Accretion of premium or discount on marketable debt securities 40,204 104,282
Stock-based compensation 2,990,157 1,479,481
Foreign currency losses 400,542 1,715,901
Unrealized gain on warrant (274,000) 0
Deferred income taxes (1,170,017) 1,192,128
Gain on sale of property and plant 0 (7,700,522)
Other non-cash items 673,720 503,115
Change in warranty reserves 68,003 0
Changes in assets and liabilities, net of acquired assets and liabilities:    
Accounts receivable 71,400 (524,084)
Inventory (2,519,197) (1,231,705)
Prepaid expenses and other current assets 13,345 213,028
Accounts payable and accrued expenses 1,743,215 1,271,171
Billings in excess of revenue earned (253,480) (132,740)
Net cash used in operating activities (19,840,802) (20,036,691)
Cash flows from investing activities:    
Other assets (79,916) (7,801)
Capital expenditures (1,341,744) (329,414)
Proceeds from sale of marketable debt securities 33,395,422 43,836,978
Purchase of marketable debt securities (22,974,668) (45,905,075)
Proceeds from sale of property and plant 0 8,106,819
Cash paid for acquisition, net of cash acquired (3,690,047) 0
Proceeds from sale of III-V product line 0 15,000,000
Net cash provided by investing activities 5,309,047 20,701,507
Cash flows from financing activities:    
Sale of unregistered stock 24,664,250 0
Settlements of restricted stock for tax withholding obligations 0 (9,153)
Net cash provided by (used in) financing activities 24,664,250 (9,153)
Effect of exchange rate changes on cash (72,436) 574,850
Net increase in cash and equivalents 10,060,059 1,230,513
Cash and equivalents:    
Beginning of period 15,822,495 19,767,889
End of period 25,882,554 20,998,402
Supplemental disclosure of cash flow information:    
Income taxes paid $ 0 $ 366,000