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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |
Settlement and Royalty Indemnity Obligation | The following table summarizes the Company's legal settlements and accruals as described above, which are presented in the Consolidated Balance Sheets:
|  | As of December 31,
(in thousands) |  | 2016 |  | 2015
Settlement and Royalty Indemnification |  | $ | 5,656 |  |  | $ | 6,502 |
Legal settlements |  | 5,050 |  |  | — |
Legal settlements and accruals, current |  | 10,706 |  |  | 6,502 |
Settlement and Royalty Indemnification, long-term |  | 5,382 |  |  | 13,797 |
Total legal settlements and accruals |  | $ | 16,088 |  |  | $ | 20,299 |
Schedule of Debt | The following tables summarize the LOC outstanding and related collateral reported in the Consolidated Balance Sheets:
|  | As of December 31, 2016
(in thousands) |  | LOC Outstanding |  | Utilization of LOC Availability |  | Restricted Cash |  | Restricted cash, long-term |  | Investment securities, restricted, long-term
Contract performance - equipment systems |  | $ | 1,855 |  |  | $ | 1,776 |  |  | $ | 86 |  |  | $ | — |  |  | $ | — |
Royalty award |  | 7,150 |  |  | — |  |  | 7,150 |  |  | — |  |  | — |
Other |  | 6,500 |  |  | — |  |  | 6,500 |  |  | — |  |  | — |
Total LOC outstanding |  | $ | 15,505 |  |  | $ | 1,776 |  |  | $ | 13,736 |  |  | $ | — |  |  | $ | — |
|  | As of December 31, 2015
(in thousands) |  | LOC Outstanding |  | Utilization of LOC Availability |  | Restricted Cash |  | Restricted cash, long-term |  | Investment securities, restricted, long-term
Contract performance - equipment systems |  | $ | 5,556 |  |  | — |  |  | $ | 728 |  |  | $ | 4,830 |  |  | $ | — |
Royalty award |  | 6,150 |  |  | — |  |  | — |  |  | 6,150 |  |  | — |
Other |  | 328 |  |  | — |  |  | — |  |  | — |  |  | 336 |
Total LOC outstanding |  | $ | 12,034 |  |  | $ | — |  |  | $ | 728 |  |  | $ | 10,980 |  |  | $ | 336 |
Schedule of Maturities of Long-term Debt | The following tables summarizes the expiration periods of the letters of credit based on the ultimate maturity date of the letters of credit as of December 31, 2016:
|  | Expiration of Letters of Credit as of December 31, 2016
(in thousands) |  | Less than 1 year |  | 1-3 years |  | 4-5 years |  | After 5 years
Letters of credit |  | $ | 10,855 |  |  | $ | 4,650 |  |  | $ | — |  |  | $ | — |
Schedule of Future Minimum Rental Payments for Operating Leases | Annual minimum commitments under the leases as of December 31, 2016 are as follows:
Years Ending December 31, | Operating Lease Commitments (in thousands)
2017 | $ | 290 |
2018 | 268 |
2019 | 174 |
2020 | 55 |
Thereafter | — |
Total | $ | 787 |
Schedule of Rent Expense | Rent expense incurred for the years ended are as follows:
|  | Years Ended December 31,
(in thousands) |  | 2016 |  | 2015 |  | 2014
Rent expense |  | $ | 847 |  |  | $ | 1,838 |  |  | $ | 1,531 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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