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Commitments and Contingencies | 6 Months Ended
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Jun. 30, 2018
Commitments and Contingencies |
Commitments and Contingencies | 13. Commitments and Contingencies Operating leases The Company also leases equipment and facilities under non-cancelable operating leases expiring at various dates through 2021. The Company also leases its office in Colorado Springs from a related party under a non-cancelable operating lease which expires in 2019. Future minimum lease payments under operating leases are as follows:
|  | Payments due by Period
|  | Total |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 and Thereafter
|  | (in thousands)
Operating leases |  | $ | 361 |  | $ | 102 |  | $ | 113 |  | $ | 74 |  | $ | 72 |  | $ | -
Other Commitments As of June 30, 2018, the Company has equipment purchase commitments aggregating approximately $2.3 million.

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details
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