Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash	$ 518	$ 562
Restricted cash	15	15
Total current assets	533	577
Long-term deposit	35	35
Property and equipment, net	632	501
Total assets	1,200	1,113
Current liabilities
Accounts payable and accrued expenses	557	1,103
Advances from related parties	36	308
Current portion of deferred rent	10
Total current liabilities	603	1,411
Deferred rent	105
Total liabilities	708	1,411
Preferred stock par value $0.01: 5,000,000 shares authorized; 4,208 shares and 1,935 shares issued and outstanding as of December 31, 2018 and December 31, 2017, respectively; aggregate liquidation preference of $4,208 and $1,935 as of December 31, 2018 and December 31, 2017, respectively	4,208	1,935
COMMITMENTS AND CONTINGENCIES (NOTE 9)
Stockholders' deficit:
Common stock par value $0.01: 57,000,000 shares authorized; 39,044,549 shares and 33,350,506 shares issued and 38,329,799 shares and 32,635,756 shares outstanding at December 31, 2018 and December 31, 2017, respectively	390	334
Additional paid-in capital	21,586	18,482
Treasury stock at cost: 714,750 shares as of December 31, 2018 and December 31, 2017	(69)	(69)
Accumulated deficit	(25,623)	(20,276)
Stockholders' deficit attributed to alpha-En Corporation stockholders	(3,716)	(1,529)
Non-controlling interest		(704)
Total stockholders' deficit	(3,716)	(2,233)
TOTAL LIABILITIES AND STOCKHOLDERS' DEFICIT AND TEMPORARY EQUITY	1,200	1,113
Common Class B [Member]
Stockholders' deficit:
Common stock par value $0.01: 57,000,000 shares authorized; 39,044,549 shares and 33,350,506 shares issued and 38,329,799 shares and 32,635,756 shares outstanding at December 31, 2018 and December 31, 2017, respectively

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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

- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.