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Balance Sheet Accounts | 12 Months Ended
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Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract] |
Balance Sheet Accounts | Balance Sheet Accounts Cash and Cash Equivalents — As of December 31, 2016 and December 31, 2017, our cash equivalents consisted of money market accounts that invested in U.S. government-sponsored enterprise bonds and discount notes, U.S. government treasury bills and notes and repurchase agreements collateralized by U.S. government obligations. As of December 31, 2016 and December 31, 2017, our cash equivalents carried no unrealized gains or losses and we did not realize any significant gains or losses on sales of cash equivalents during the years ended December 31, 2016 and 2017. As of December 31, 2016 and December 31, 2017, our cash and cash equivalent balances were invested as follows (in thousands):
| December 31, 2016 |  | December 31, 2017
Cash | $ | 4,066 |  |  | $ | 5,098 |
Money market funds | 57,715 |  |  | 35,195 |
Total cash and cash equivalents | $ | 61,781 |  |  | $ | 40,293 |
Concentration of Credit Risk — Our financial instruments that are exposed to concentrations of credit risk principally consist of cash, cash equivalents and accounts receivable. We invest our cash and cash equivalents with major banks and financial institutions and, at times, such investments are in excess of federally insured limits. We also have deposits with major banks in China that are denominated in both U.S. dollars and Chinese Yuan Renminbi and are not insured by the U.S. federal government. We do not require collateral or other security for our accounts receivable. As of December 31, 2016, four customers represented 23%, 17%, 15%, and 12%, respectively, for a combined total of 67% of our $1.9 million outstanding accounts receivable balance. As of December 31, 2017, three customers represented 25%, 22%, and 14%, respectively, or a combined total of 61%, of our $1.5 million outstanding accounts receivable balance. No other customers represented 10% or more of our total accounts receivable at December 31, 2016 and December 31, 2017. We believe the potential for collection issues with any of our customers was minimal as of December 31, 2017. Accordingly, our estimate for uncollectible amounts at December 31, 2017 and 2016 was not material. As of December 31, 2016 and December 31, 2017, Medicare commissions receivable accounted for 81% and 71%, respectively, of the total commissions receivable balance. Prepaid Expenses and Other Current Assets — Prepaid expenses and other current assets consisted of the following (in thousands):
| December 31, 2016 |  | December 31, 2017
Prepaid maintenance contracts | $ | 2,026 |  |  | $ | 1,944 |
Prepaid insurance | 541 |  |  | 490 |
Prepaid rent | 370 |  |  | 311 |
Other current assets | 1,140 |  |  | 1,560 |
Prepaid expenses and other current assets | $ | 4,077 |  |  | $ | 4,305 |
Property and Equipment — Property and equipment consisted of the following (in thousands):
| December 31, 2016 |  | December 31, 2017
Computer equipment and software | $ | 17,524 |  |  | $ | 17,112 |
Office equipment and furniture | 3,490 |  |  | 3,583 |
Leasehold improvements | 3,173 |  |  | 3,156 |
Property and equipment, gross | 24,187 |  |  | 23,851 |
Less accumulated depreciation and amortization | (18,579 | ) |  | (19,146 | )
Property and equipment, net | $ | 5,608 |  |  | $ | 4,705 |
Depreciation and amortization expense related to property and equipment totaled $4.1 million, $3.5 million and $2.8 million in the years ended December 31, 2015, 2016 and 2017, respectively. Other Assets — Other assets consisted of the following (in thousands):
| December 31, 2016 |  | December 31, 2017
Capitalized project costs | $ | 2,735 |  |  | $ | 4,481 |
Security deposits | 589 |  |  | 545 |
Deferred tax assets | 204 |  |  | 232 |
Other assets | 279 |  |  | 2,029 |
Other assets | $ | 3,807 |  |  | $ | 7,287 |
Intangible Assets — The carrying amounts, accumulated amortization, net carrying value and weighted average remaining life of our definite-lived amortizable intangible assets, as well as our indefinite-lived intangible trademarks, are presented in the tables below for (dollars in thousands, weighted-average useful life is as of December 31, 2017):
| December 31, 2016 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Weighted Average Remaining Life
Technology | $ | 1,700 |  |  | $ | (1,700 | ) |  | $ | — |  |  | $ | 1,700 |  |  | $ | (1,700 | ) |  | $ | — |  |  | 0 years
Pharmacy and customer relationships | 10,100 |  |  | (6,934 | ) |  | 3,166 |  |  | 10,100 |  |  | (7,884 | ) |  | 2,216 |  |  | 2.3 years
Trade names, trademarks and website addresses | 907 |  |  | (607 | ) |  | 300 |  |  | 907 |  |  | (697 | ) |  | 210 |  |  | 2.3 years
Total intangible assets subject to amortization | $ | 12,707 |  |  | $ | (9,241 | ) |  | $ | 3,466 |  |  | $ | 12,707 |  |  | $ | (10,281 | ) |  | $ | 2,426 |  |  |
Indefinite-lived trademarks and domain names |  |  |  |  | 5,114 |  |  |  |  |  |  | 5,114 |  |  | Indefinite
Intangible assets |  |  |  |  | $ | 8,580 |  |  |  |  |  |  | $ | 7,540 |  |  |
During the years ended December 31, 2015, 2016 and 2017, amortization expense related to intangible assets totaled $1.2 million, $1.0 million and $1.0 million, respectively. As of December 31, 2017, expected amortization expense in future periods is as follows (in thousands):
Years Ending December 31, | Pharmacy and Customer Relationships |  | Trade Names, Trademarks and Website Addresses |  | Total
2018 | $ | 950 |  |  | $ | 90 |  |  | $ | 1,040 |
2019 | 950 |  |  | 90 |  |  | 1,040 |
2020 | 316 |  |  | 30 |  |  | 346 |
Total | $ | 2,216 |  |  | $ | 210 |  |  | $ | 2,426 |
Other Current Liabilities — Other current liabilities consisted of the following (in thousands):
| December 31, 2016 |  | December 31, 2017
Deferred revenue | $ | 851 |  |  | $ | 385 |
Professional fees | 307 |  |  | 1,012 |
Other accrued expenses | 490 |  |  | 611 |
Total other current liabilities | $ | 1,648 |  |  | $ | 2,008 |
Other Non-Current Liabilities — Non-current liabilities consisted of the following (in thousands):
| December 31, 2016 |  | December 31, 2017
Deferred rent – non-current | $ | 830 |  |  | $ | 724 |
Accrued affiliate commissions | 1,322 |  |  | 1,092 |
Income tax payable – non-current | 1,978 |  |  | 19 |
Other non-current liabilities | 123 |  |  | 85 |
Total other non-current liabilities | $ | 4,253 |  |  | $ | 1,920 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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