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Common Stock - Reconciliation of Changes in Common Shares Issued and Additional Disclosures (Details) |  | 6 Months Ended |
--- | --- | --- | ---
Nov. 09, 2009 series $ / shares shares | Jun. 30, 2017 $ / shares shares | Dec. 31, 2016 $ / shares shares
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock, shares authorized (in shares) | 80,000,000 | 80,000,000 | 80,000,000
Common stock, par value (in dollars per share) | $ / shares | $ 0.0001 | $ 0.0001 | $ 0.0001
Preferred stock, shares authorized (in shares) | 100,000 | 100,000 | 100,000
Preferred stock, minimum number of series authorized (series) | series | 1 |  |
Preferred stock, at par value (in dollars per share) | $ / shares | $ 0.0001 | $ 0.0001 | $ 0.0001
Reconciliation of changes in common shares issued |  |  |
Shares issued, beginning balance (in shares) |  | 59,684,669 |
Issued as restricted stock award grants (in shares) |  | 168,756 |
Issued upon exercise of stock options (in shares) |  | 651,188 |
Shares issued, ending balance (in shares) |  | 60,504,613 |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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