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Significant Accounting Policies Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Assessment of Revenue under ASC 606
A summary of the effects of cash collections on the Remaining Contracts on the unaudited condensed consolidated statements of operations for each of the three and six months ended June 30, 2021 and 2020 are as follows (amounts in thousands):
Three months ended June 30,Six months ended June 30,
2021202020212020
Net sales$313 $1,706 $611 $6,201 
Cost of sales44 239 86 868 
Gross profit$269 $1,467 $525 $5,333