Stockholders' Equity | Stockholders’ Equity Common Stock During the three months ended March 31, 2018 , the Company issued a total of 6,041,369 shares of Common Stock. 5,136,667 shares were issued upon exercise of warrants for a weighted-average price of $0.28 . In addition, 904,702 shares were issued upon vesting of restricted stock units (“RSU”). Stock Options Stock-based compensation expense related to Trovagene equity awards have been recognized in operating results as follow: Three Months Ended 2018 2017 Included in research and development expense $ 395,709 $ 372,200 Included in cost of revenue 39,631 26,156 Included in selling, general and administrative expense 970,791 601,309 Benefit from restructuring — (78,866 ) Total stock-based compensation expense $ 1,406,131 $ 920,799 The unrecognized compensation cost related to non-vested stock options outstanding at March 31, 2018 and 2017 , net of expected forfeitures, was $2,662,066 and $5,677,247 , respectively, which is expected to be recognized over a weighted-average remaining vesting period of 1.8 and 2.6 years , respectively. The weighted-average remaining contractual term of outstanding options as of March 31, 2018 was approximately 8.1 years . The total fair value of stock options vested during the three months ended March 31, 2018 and 2017 was $971,488 and $1,526,211 , respectively. The estimated fair value of stock option awards was determined on the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions during the following periods indicated: Three Months Ended 2018 2017 (1) Risk-free interest rate 2.43 % 0 % Dividend yield 0 % 0 % Expected volatility 90.28 % 0 % Expected term 5.2 years 0 (1) No options granted during the three months ended March 31, 2017. A summary of stock option activity and changes in stock options outstanding is presented below: Total Options Weighted-Average Exercise Price Per Share Intrinsic Value Balance outstanding, December 31, 2017 4,490,475 $ 4.04 $ — Granted 3,132,831 $ 0.30 Canceled / Forfeited (35,000 ) $ 5.82 Balance outstanding, March 31, 2018 7,588,306 $ 2.49 $ 154,135 Exercisable at March 31, 2018 5,156,223 $ 2.71 $ 109,892 On June 13, 2017, the number of authorized shares in the Trovagene 2014 Equity Incentive Plan (“2014 EIP”) was increased from 7,500,000 to 9,500,000 . As of March 31, 2018 there were 338,957 shares available for issuance under the 2014 EIP. Restricted Stock Units There were no RSU granted during the three months ended March 31, 2018 . The weighted-average grant date fair value of the RSU $2.05 per share during the three months ended March 31, 2017 . A summary of the RSU activity is presented below: Number of Shares Weighted-Average Grant Date Fair Value Per Share Intrinsic Value Non-vested RSU outstanding, December 31, 2017 1,274,302 $ 1.43 $ 391,848 Vested (904,702 ) $ 1.18 $ 266,461 Non-vested RSU outstanding, March 31, 2018 369,600 $ 2.05 $ 129,064 At March 31, 2018 and 2017 , total unrecognized compensation costs related to non-vested RSU were $602,134 and $1,603,214 , which are expected to be recognized over a weighted-average period of 2.8 and 3.3 years , respectively. The total fair values of vested RSU during the three months ended March 31, 2018 and 2017 were $1,070,914 and $1,091,580 , respectively. Warrants A summary of warrant activity and changes in warrants outstanding, including both liability and equity classifications is presented below: Total Warrants (1) Weighted-Average Exercise Price Per Share Weighted-Average Remaining Contractual Term (1) Balance outstanding, December 31, 2017 23,238,853 $ 0.95 4.4 Exercised (4,820,000 ) $ 0.30 Balance outstanding, March 31, 2018 18,418,853 $ 1.11 4.0 (1) Excluded the pre-funded warrants to purchase 316,667 shares of common stock at a nominal exercise price of $0.01 per share. The pre-warrants were exercised in full during the three months ended March 31, 2018 . |