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Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2016
Related Party Transactions
Related Party Transactions	13. Related Party Transactions The Company rented an office in Northville, Michigan from an LLC owned by two officers under a short‑term agreement during the three and six month periods ended June 30, 2016 and 2015. Rent expense under the related party agreement was $8,000 and $4,000 during the three months ended June 30, 2016 and 2015, respectively, and $16,000 and $9,000 during the six months ended June 30, 2016 and 2015, respectively. A prepaid rent balance related to the short‑term agreement amounted to $3,000 as of June 30, 2016 and December 31, 2015. During the first quarter of 2015, the Company issued $2.0 million of additional Convertible Notes (the 2015 Notes) as part of the Convertible Notes described in Note 4 — Debt. The 2015 Notes included four notes in the aggregate of $0.3 million issued to investors who were related to one board member and three officers of the Company. On March 31, 2015, all of the Convertible Notes (including the 2015 Notes) were converted into 516,421 shares of Series A preferred stock. The conversion included a total of 68,649 shares of Series A preferred stock issued to two officers of the Company, and 63,967 shares of Series A preferred stock issued to investors related to one board member and three officers of the Company. During the third quarter of 2015, the Company issued $2.8 million of Interim Notes as described in Note 4 — Debt. The Interim Notes included five notes issued to two officers and three board members (or entities they control) in the amount of $0.5 million. In addition, the Interim Notes included four notes to investors who were related to three of the Company’s officers and to one of the Company’s key employees in the amount of $0.3 million. In December 2015, the Company issued an additional $2.7 million of Interim Notes, as described in Note 4 — Debt, which included six notes issued to two officers and four board members in the amount of $0.6 million. The December 2015 Interim Note issuances also included five notes to investors who were related to three of the Company’s officers in the amount of $0.2 million. In February 2016, the Company issued an additional $0.2 million of Interim Notes, as described in Note 4 — Debt, which included two notes issued to two board members (or entities they control) in the amount of $81,000. The February 2016 Interim Note issuances also included a $20,000 note to an investor who is related to an officer of the Company The April 2016 Interim Note issuances of $5.0 million included two notes to investors who were related to two of the Company’s officers in the aggregate amount of $0.2 million. The April 2016 Interim Notes issuances also included three notes to investors who were related to three of the Company’s directors in the aggregate amount of $2.3 million.