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Commitments and Contingencies - Narrative (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) facility | Sep. 30, 2016 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |
Number of leased facilities | facility |  |  | 2 |
Rent expense | $ 74,000 | $ 72,000 | $ 221,000 | $ 218,000
Penalty for not meeting minimum requirements |  |  | 0 |
Colorado |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Letters of credit outstanding, amount | 18,000 |  | 18,000 |
Colorado | Wells Fargo Bank, N.A. |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Letters of credit outstanding, amount | $ 18,000 |  | $ 18,000 |

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Details
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