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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 7 Months Ended 9 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Oct. 26, 2019
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:            
Net loss $ (7,933) $ (3,417) $ (3,539) $ (11,209) $ (15,062) $ (11,209)
Adjustments to reconcile net loss to net cash used in operations:            
Depreciation and amortization       3,312 3,811  
Stock-based compensation expense       1,236 2,597  
Provision for excess and obsolete inventory 400     491 1,610 500
Deferred income taxes       (1,069) (1,828)  
Change in fair value of contingent consideration 2,740     2,740
Change in fair value of warrants     (4,648) 4,648
Non-cash interest income       (48)  
Other non-cash items       (22) 291  
Unrealized foreign exchange loss/(gain) on cash and cash equivalents       (209) 366  
Changes in operating asset and liability accounts:            
Accounts receivable       (8,661) 6,376  
Inventory       (6,968) 7,419  
Prepaid expenses and other assets       (332) 6  
Accounts payable and accrued expenses       2,648 (7,894)  
Deferred revenue       7,652 (5,255)  
Net cash used in operating activities       (17,779) (4,871)  
Cash flows from investing activities:            
Purchase of property, plant and equipment       (2,926) (1,574)  
Proceeds from the sale of property, plant and equipment       3,001 1  
Purchase of marketable securities       (35,000)  
Sale of marketable securities       25,006  
Cash paid for acquisition       (26,000)  
Change in other assets       37 (6)  
Net cash used in investing activities       (34,888) (2,573)  
Cash flows from financing activities:            
Employee taxes paid related to net settlement of equity awards       (565) (927)  
Proceeds from exercise of warrants       6,139  
Proceeds from public equity offering, net       51,477  
Proceeds from exercise of employee stock options and ESPP       100 99  
Net cash provided by financing activities       5,674 50,649  
Effect of exchange rate changes on cash       30 73  
Net increase/(decrease) in cash, cash equivalents and restricted cash       (46,963) 43,278  
Cash, cash equivalents and restricted cash at beginning of period   $ 30,864 $ 78,198 78,198 30,864 $ 78,198
Cash, cash equivalents and restricted cash at end of period 74,142     31,235 74,142  
Supplemental schedule of cash flow information:            
Cash paid for income taxes, net of refunds       3,520 630  
Non-cash investing and financing activities            
Issuance of common stock to settle liabilities       242 271  
Hercules [Member]            
Non-cash investing and financing activities            
Issuance of common stock       294  
Northeast Power Systems, Inc (NEPSI) [Member]            
Adjustments to reconcile net loss to net cash used in operations:            
Change in fair value of contingent consideration $ 2,700       2,700  
Non-cash investing and financing activities            
Issuance of common stock       $ 12,433