Convertible Notes	9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]
Convertible Notes	12. Convertible Notes Related Party On December 19, 2014, the Company issued a subordinated convertible debenture with a $7,500 face amount payable to Terex, a related party. The convertible debenture, is subordinated, carries a 5% per annum coupon, and is convertible into Company common stock at a conversion price of $13.65 per share or a total of 549,451 shares, subject to customary adjustment provisions. The debenture has a December 19, 2020 maturity date. From and after the third anniversary of the original issuance date, the Company may redeem the convertible debenture in full (but not in part) at any time that the last reported sale price of the Company’s common stock equals at least 130% of the Conversion Price (as defined in the debenture) for at least 20 of any 30 consecutive trading days. Following an election by the holder to convert the debenture into common stock of the Company in accordance with the terms of the debenture, the Company has the discretion to deliver to the holder either (i) shares of common stock, (ii) a cash payment, or (iii) a combination of cash and stock. As of September 30, 2017, the note had a remaining principal balance of $6,968 and an unamortized discount of $532. Perella Notes On January 7, 2015, the Company entered into a Note Purchase Agreement (the “Perella Note Purchase Agreement”) with MI Convert Holdings LLC (which is owned by investment funds constituting part of the Perella Weinberg Partners Asset Based Value Strategy) and Invemed Associates LLC (together, the “Investors”), pursuant to which the Company agreed to issue $15,000 in aggregate principal amount of convertible notes due January 7, 2021 (the “Perella Notes”) to the Investors. The Notes are subordinated, carry a 6.50% per annum coupon, and are convertible, at the holder’s option, into shares of Company common stock, based on an initial conversion price of $15.00 per share, subject to customary adjustments. Following an election by the holder to convert the debenture into common stock of the Company in accordance with the terms of the debenture, the Company has the discretion to deliver to the holder either (i) shares of common stock, (ii) a cash payment, or (iii) a combination of cash and stock. Upon the occurrence of certain fundamental corporate changes, the Perella Notes are redeemable at the option of the holders of the Perella Notes. The Perella Notes are not redeemable at the Company’s option prior to the maturity date, and the payment of principal is subject to acceleration upon an event of default. The issuance of the Perella Notes by the Company was made in reliance upon the exemptions from registration provided by Rule 506 and Section 4(a)(2) of the Securities Act of 1933. In accordance with a Registration Rights Agreement with the Investors dated January 7, 2015, the Company agreed to register the resale of the shares of common stock issuable upon conversion of the Perella Notes. The Registration Statement on Form S-3 filed by the Company was declared effective on February 23, 2015. As of September 30, 2017, the note had a remaining principal balance of $14,257, net of debt issuance costs of $318, and an unamortized discount of $318.

12. Convertible Notes

Related Party

On December 19, 2014, the Company issued a subordinated convertible debenture with a $7,500 face amount payable to Terex, a related party. The convertible debenture, is subordinated, carries a 5% per annum coupon, and is convertible into Company common stock at a conversion price of $13.65 per share or a total of 549,451 shares, subject to customary adjustment provisions. The debenture has a December 19, 2020 maturity date.

From and after the third anniversary of the original issuance date, the Company may redeem the convertible debenture in full (but not in part) at any time that the last reported sale price of the Company’s common stock equals at least 130% of the Conversion Price (as defined in the debenture) for at least 20 of any 30 consecutive trading days. Following an election by the holder to convert the debenture into common stock of the Company in accordance with the terms of the debenture, the Company has the discretion to deliver to the holder either (i) shares of common stock, (ii) a cash payment, or (iii) a combination of cash and stock.

As of September 30, 2017, the note had a remaining principal balance of $6,968 and an unamortized discount of $532.

Perella Notes

On January 7, 2015, the Company entered into a Note Purchase Agreement (the “Perella Note Purchase Agreement”) with MI Convert Holdings LLC (which is owned by investment funds constituting part of the Perella Weinberg Partners Asset Based Value Strategy) and Invemed Associates LLC (together, the “Investors”), pursuant to which the Company agreed to issue $15,000 in aggregate principal amount of convertible notes due January 7, 2021 (the “Perella Notes”) to the Investors. The Notes are subordinated, carry a 6.50% per annum coupon, and are convertible, at the holder’s option, into shares of Company common stock, based on an initial conversion price of $15.00 per share, subject to customary adjustments. Following an election by the holder to convert the debenture into common stock of the Company in accordance with the terms of the debenture, the Company has the discretion to deliver to the holder either (i) shares of common stock, (ii) a cash payment, or (iii) a combination of cash and stock. Upon the occurrence of certain fundamental corporate changes, the Perella Notes are redeemable at the option of the holders of the Perella Notes. The Perella Notes are not redeemable at the Company’s option prior to the maturity date, and the payment of principal is subject to acceleration upon an event of default. The issuance of the Perella Notes by the Company was made in reliance upon the exemptions from registration provided by Rule 506 and Section 4(a)(2) of the Securities Act of 1933.

In accordance with a Registration Rights Agreement with the Investors dated January 7, 2015, the Company agreed to register the resale of the shares of common stock issuable upon conversion of the Perella Notes. The Registration Statement on Form S-3 filed by the Company was declared effective on February 23, 2015.

As of September 30, 2017, the note had a remaining principal balance of $14,257, net of debt issuance costs of $318, and an unamortized discount of $318.