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Condensed Statements of Cash Flows (Unaudited)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
OPERATING CASH FLOW  
Net loss $ (23,373)
Adjustments to reconcile net loss to operating cash flow:  
Depreciation 577
Amortization of intangibles 44
Equity-based compensation expense 1,021
Net noncash change in right of use assets and lease liabilities 406
Changes in assets and liabilities:  
Prepaid expenses and other assets (1,371)
Accounts receivable (2,716)
Accounts payable and accrued expenses (646)
Lease liability (452)
Deferred DOE cost share (105)
Deferred revenue (773)
Accrued compensation (5,763)
Net cash used in operating activities (33,151)
INVESTING CASH FLOW  
Purchases of property, plant and equipment (1,187)
Net cash used in investing activities (1,187)
FINANCING CASH FLOW  
Proceeds from exercise of common unit options 470
Repurchase of common units (563)
Issuance of treasury units 20
Net cash used in financing activities (73)
Net change in cash (34,411)
Cash and cash equivalents:  
Cash - beginning of the period 77,094
Cash - ending of the period 42,683
Summary of noncash investing and financing activities:  
Conversion of equity options to liability award $ 1,540