Redeemable Convertible Preferred Stock	12 Months Ended
Dec. 31, 2016
Redeemable Convertible Preferred Stock [Abstract]
Redeemable Convertible Preferred Stock	15. Redeemable Convertible Preferred Stock Prior to the initial public offering, the Company had outstanding 1,838,027 shares of $0.001 par value Series A preferred stock. Given that certain redemption features of the Series A preferred stock were not solely within the control of the Company, the Series A preferred stock was classified outside of stockholders' equity. On May 6, 2016, the Company and each of the holders of the Series A preferred stock entered into an agreement requiring the mandatory conversion of the shares of the Series A preferred stock into fully paid and nonassessable shares of the Company’s common stock. This agreement was amended on September 5, 2016 to provide for the automatic conversion of a portion of the outstanding Series A preferred stock in connection with the sale of shares of the Company’s common stock by the holders of the Series A preferred stock to Magnus. This automatic conversion of all outstanding Series A preferred stock occurred prior to the closing of the Company’s initial public offering. Upon conversion, all accrued but unpaid dividends on the shares of the Series A preferred stock were paid to each holder of the shares of the Series A preferred stock. Dividends The holders of the Series A preferred stock were entitled to receive cumulative dividends at a rate of 7.5% per year of the Original Issue Price (as defined below) when, as and if declared by the board of directors. The dividends accrued on a daily basis and were payable semi-annually. The Original Issue Price is $100 per share of Series A preferred stock. The Company declared and paid dividends to the holders of the Series A preferred stock of $17.3 million, $13.7 million and $13.8 million during the years ended December 31, 2016, 2015 and 2014, respectively. Cumulative undeclared dividends as of December 31, 2015 were $5.8 million. Reissuance Shares of Series A preferred stock that are redeemed or converted were canceled and retired and cannot be reissued by the Company.

15. Redeemable Convertible Preferred Stock

Prior to the initial public offering, the Company had outstanding 1,838,027 shares of $0.001 par value Series A preferred stock. Given that certain redemption features of the Series A preferred stock were not solely within the control of the Company, the Series A preferred stock was classified outside of stockholders' equity.

On May 6, 2016, the Company and each of the holders of the Series A preferred stock entered into an agreement requiring the mandatory conversion of the shares of the Series A preferred stock into fully paid and nonassessable shares of the Company’s common stock. This agreement was amended on September 5, 2016 to provide for the automatic conversion of a portion of the outstanding Series A preferred stock in connection with the sale of shares of the Company’s common stock by the holders of the Series A preferred stock to Magnus. This automatic conversion of all outstanding Series A preferred stock occurred prior to the closing of the Company’s initial public offering. Upon conversion, all accrued but unpaid dividends on the shares of the Series A preferred stock were paid to each holder of the shares of the Series A preferred stock.

Dividends

The holders of the Series A preferred stock were entitled to receive cumulative dividends at a rate of 7.5% per year of the Original Issue Price (as defined below) when, as and if declared by the board of directors. The dividends accrued on a daily basis and were payable semi-annually. The Original Issue Price is $100 per share of Series A preferred stock. The Company declared and paid dividends to the holders of the Series A preferred stock of $17.3 million, $13.7 million and $13.8 million during the years ended December 31, 2016, 2015 and 2014, respectively. Cumulative undeclared dividends as of December 31, 2015 were $5.8 million.

Reissuance

Shares of Series A preferred stock that are redeemed or converted were canceled and retired and cannot be reissued by the Company.