Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 44,429	$ 79,682
Accounts receivable (less reserve for doubtful accounts of $36; including $48 and $123 from related parties as of December 31, 2018 and 2017, respectively)	6,792	5,599
Inventory	5,945	3,571
Prepaid expenses and other current assets	2,330	400
Total current assets	59,496	89,252
Restricted Cash	1,000
Property and equipment, net	2,923	1,874
Intangible assets, net	2,348
Goodwill	1,308
Other non-current assets	536	653
Total assets	67,611	91,779
Current liabilities:
Accounts payable (including $36 and $0 to related parties as of December 31, 2018 and 2017, respectively)	5,110	3,552
Accrued compensation and benefits	4,449	2,624
Other accrued expenses (including $226 and $170 to related parties as of December 31, 2018 and 2017, respectively)	3,129	3,560
Deferred revenue (including $33 and $1,182 with related parties as of December 31, 2018 and 2017, respectively)	5,437	4,942
Current portion of long term debt		5,036
Total current liabilities	18,125	19,714
Deferred revenue, net of current portion (including $0 and $1,074 with related parties as of December 31, 2018 and 2017, respectively)	520	1,709
Long term debt, net of current portion	7,623	4,346
Other non-current liabilities	278	144
Total liabilities	26,546	25,913
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value: Authorized-120,000,000 shares as of December 31, 2018 and December 31, 2017; issued and outstanding- 22,369,036 and 21,707,041 shares as of December 31, 2018 and 2017, respectively	22	22
Additional paid-in capital	216,931	210,196
Accumulated deficit	(175,888)	(144,352)
Total stockholders' equity	41,065	65,866
Total liabilities and stockholders' equity	$ 67,611	$ 91,779

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.