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Common Stock and Other Equity Related Transactions - Employee Stock Purchase Program (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 10, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee Stock Purchase Program [Line Items] |  |  |  |
ESPP, purchase price discount (in percentage) | 85.00% |  |  |
ESPP, issued during the period (in shares) |  | 22,071 | 24,715 | 17,037
Employee Stock Purchase Plan |  |  |  |
Employee Stock Purchase Program [Line Items] |  |  |  |
Amendment Date |  | May 10, 2016 |  |
Maximum |  |  |  |
Employee Stock Purchase Program [Line Items] |  |  |  |
ESPP authorized amount | $ 250,000 |  |  |
Number of shares authorized ESPP (in shares) | 2,000,000 |  |  |

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- Definition Annual value of shares authorized for issuance for the employee stock purchase plan. + References No definition available. + Details
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- Definition Common stock purchased through our Employee Stock Purchase Program can be purchased at a price equal to 85% of the lesser of: (a) the closing price for a share of common stock on the last day of the offering period; and (b) the closing price for a share of common stock on the first day of the offering period. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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