SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Cash and Cash Equivalents and Restricted Cash

Highly liquid investments with a maturity of three months or less when purchased are classified as cash equivalents. Restricted cash consists of cash balances held by financial institutions as collateral for letters of credit. These balances are reclassified to cash and cash equivalents when the underlying obligation is satisfied, or in accordance with the governing agreement. As of March 31, 2018, the Company had a restricted cash balance, in a money market account, of approximately $5.0 million to cash collateralize outstanding letters of credit.

Collectability of Accounts Receivable

The following table sets forth the aging of our net accounts receivable (net of allowance for contractual adjustments and implicit price concessions as of March 31, 2018, and net of allowance for contractual adjustments, prior to allowance for doubtful accounts, as of March 31, 2017), aged based on date of service and categorized based on the three primary overall types of accounts receivable characteristics (in thousands):



	March 31, 2018						December 31, 2017
	0 - 180 days		Over 180 days		Total		0 - 180 days		Over 180 days		Total
Government	$	18,367	$	1,604	$	19,971	$	20,602	$	10,082	$	30,684
Commercial	61,561		2,019		63,580		63,767		18,779		82,546
Patient	3,819		815		4,634		2,577		7,627		10,204
Gross accounts receivable	$	83,747	$	4,438	88,185		$	86,946	$	36,488	123,434
Allowance for doubtful accounts					—						(37,912		)
Net accounts receivable					$	88,185					$	85,522

Implementation of Topic 606 effectively eliminated the allowance for doubtful accounts as we provided implicit price concessions to payors, and patients with co-pays, deductibles, and co-insurance. Amounts presented reflect reductions from the amounts billed to reflect the estimated transaction price, net of estimated implicit price concessions and contractual adjustments.

Recent Accounting Pronouncements

In May 2014, the FASB issued ASU 2014-09—Revenue from Contracts with Customers (Topic 606). The guidance requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The FASB delayed the effective date to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. The Company did not elect early adoption and applied the modified retrospective approach upon adoption which results in application of the new guidance only to contracts that are not completed at the adoption date and does not require adjustment of prior reporting periods. Assessment of the new guidance did not result in an opening retained earnings adjustment, but did result in the adjustment of accounts receivable as the allowance for doubtful accounts was eliminated upon implementation. Pursuant to the requirements of Topic 606, the transaction price to be recognized as revenue is estimated based upon the amount of cash ultimately expected to be collected. Therefore, amounts expected to be written off are reflected in the amount of revenue recognized upon fulfillment of the performance obligation. The new standard resulted in the recognition of amounts previously reported as bad debt expense as a reduction to revenue upon implementation; see Note 3 - Revenue.

In July 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-11—Earnings Per Share (Topic 260), Distinguishing Liabilities From Equity (Topic 480), and Derivatives and Hedging (Topic 815): I. Accounting for Certain Financial Instruments with Down Round Features and II. Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception. ASU 2017-11 eliminates the requirement that a down round feature precludes equity classification when assessing whether an instrument is indexed to an entity’s own stock. A freestanding equity-linked financial instrument no longer would be accounted for as a derivative liability at fair value as a result of the existence of a down round feature. The effective date for ASU 2017-11 is for annual or any interim periods beginning after December 15, 2018. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements.

In May 2017, the FASB issued ASU 2017-09—Compensation–Stock Compensation (Topic 718): Scope of Modification Accounting. ASU 2017-09 modifies when a change to the terms or conditions of a share-based payment award must be accounted for as a modification. The new guidance requires modification accounting if the fair value, vesting condition or the classification of the award is not the same immediately before and after a change to the terms and conditions of the award. The effective date for ASU 2017-09 is for annual or any interim periods beginning after December 15, 2017. The Company adopted this ASU effective January 1, 2018. The adoption of this standard did not materially impact the Company’s consolidated financial statements.

In November 2016, the FASB issued ASU 2016-18—Statement of Cash Flows (Topic 230): Restricted Cash. ASU 2016-18 requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The effective date for ASU 2016-18 is for annual or any interim periods beginning after December 15, 2017. The Company adopted this ASU effective January 1, 2018. The adoption of this standard did not materially impact the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15—Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. ASU 2016-15 provides guidance for eight specific cash flow issues with respect to how cash receipts and cash payments are classified in the statements of cash flows, with the objective of reducing diversity in practice. The effective date for ASU 2016-15 is for annual periods beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company adopted this ASU effective January 1, 2018. The adoption of this standard did not materially impact the Company’s consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02—Leases (Topic 842), requiring lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. The effective date of the new standard for public companies is for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted. The new standard may be adopted using a modified retrospective transition and requires application of the new guidance at the beginning of the earliest comparative period presented. The Company is evaluating the effect that the updated standard will have on its consolidated financial statements.