The Company’s significant accounting policies are described in Note 2, “Significant Accounting Policies,” in its Annual Report on Form 10-K for the year ended December 31, 2018.

In the first quarter of 2019, the Company adopted ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”). The Company assesses its contracts at inception to determine whether the contract contains a lease, including evaluation of whether the contract conveys the right to control an explicitly or implicitly identified asset for a period of time. The Company has recognized right-of-use assets and lease liabilities that represent the net present value of future operating lease payments utilizing a discount rate corresponding to the Company’s incremental borrowing rate and amortizing over the remaining terms of the leases. See the Recently Adopted Accounting Pronouncements below for additional information related to the adoption of this guidance.

The Company records stock-based payments at fair value. The measurement date for compensation expense related to awards is generally the date of the grant. The fair value of awards is recognized as an expense in the statement of operations over the requisite service period, which is generally the vesting period. The fair value of options is calculated using the Black-Scholes option pricing model. This option valuation model requires the use of assumptions including, among others, the volatility of stock price, the expected term of the option, and the risk-free interest rate.

The following assumptions were used to estimate the fair value of stock options granted during the three-month period ending March 31, 2019 and 2018 using the Black-Scholes option pricing model:

	2019	2018
Risk-free interest rate	2.44% - 2.57%	2.27% – 2.98%
Expected life (years)	6.25	6.25
Volatility	60%	60%
Dividend rate	0%	0%

The Company’s accounting principles require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of assets and liabilities at the date of the condensed financial statements and reported amounts of revenues and expenses during the reporting period. Estimates having relatively higher significance include the accounting for acquisitions, stock-based compensation, and income taxes. Actual results could differ from those estimates and changes in estimates may occur.

The Company recorded no income tax expense or benefit during the three months ended March 31, 2019 and 2018, due to a full valuation allowance recognized against its deferred tax assets.

Basic and diluted net loss per common share is computed by dividing net loss in each period by the weighted average number of shares of common stock outstanding during such period. For the periods presented, common stock equivalents, consisting of stock-based awards, were not included in the calculation of the diluted loss per share because to do so would be anti-dilutive.

In February 2016, the FASB issued ASU No. 2016-02, which establishes new accounting and disclosure requirements for leases. ASU No. 2016-02 requires lessees to classify most leases as either finance or operating leases and to initially recognize a lease liability and right-of-use asset. The Company adopted ASU 2016-02 in the first quarter of 2019 using the effective date approach to recognize and measure leases as of the adoption date. The Company has elected to utilize the available practical expedient to not separate lease components from non-lease components as well as the package of practical expedients that allows the Company not to reassess (1) whether any expired or existing contracts as of the adoption date are or contain a lease, (2) lease classification for any expired or existing leases as of the adoption date and (3) initial direct costs for any existing leases as of the adoption date. As a result of the adoption of this guidance, the Company recorded a non-cash transaction to recognize on January 1, 2019 lease liabilities totaling $0.4 million and right-of-use-assets totaling $0.4 million, which will be amortized over the remaining terms of the leases.

In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718) Improvements to Nonemployee Share-Based Payment Accounting (“ASU 2018-07”). This new guidance expands the scope of ASC 718 to include share-based payments granted to nonemployees in exchange for goods or services used or consumed in an entity’s own operations and supersedes the guidance in ASC 505-50. Equity-classified nonemployee awards are measured on the grant date, rather than on the earlier of (1) the performance commitment date or (2) the date at which the nonemployee’s performance is complete. Awards to nonemployees are measured by estimating the fair value of the equity instruments to be issued, rather than the fair value of the goods or services received or the fair value of the equity instruments issued, whichever can be measured more reliably. Entities may use the expected term to measure nonemployee options or elect to use the contractual term as the expected term, on an award-by-award basis. The Company adopted ASU 2018-07 in the first quarter of 2019. There was no impact on the Company’s financial statements as a result of the adoption of this guidance.